RT-6.1 Fix (#3369)

* RT-6.1 Fix

use GetOrCreate() for lldp interface configs
ref b/358044619
---
<sub>This code is a Contribution to the OpenConfig Feature Profiles project ("Work") made under the Google Software Grant and Corporate Contributor License Agreement ("CLA") and governed by the Apache License 2.0. No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose. This code is provided on an "as is" basis without any warranties of any kind.</sub>

* fix readme.md

---
<sub>This code is a Contribution to the OpenConfig Feature Profiles project ("Work") made under the Google Software Grant and Corporate Contributor License Agreement ("CLA") and governed by the Apache License 2.0. No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose. This code is provided on an "as is" basis without any warranties of any kind.</sub>

* sync otg and ate readmes

---
<sub>This code is a Contribution to the OpenConfig Feature Profiles project ("Work") made under the Google Software Grant and Corporate Contributor License Agreement ("CLA") and governed by the Apache License 2.0. No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose. This code is provided on an "as is" basis without any warranties of any kind.</sub>

* fix incorrect path

---
<sub>This code is a Contribution to the OpenConfig Feature Profiles project ("Work") made under the Google Software Grant and Corporate Contributor License Agreement ("CLA") and governed by the Apache License 2.0. No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose. This code is provided on an "as is" basis without any warranties of any kind.</sub>

* added same change to otg for tests to be in-sync

---
<sub>This code is a Contribution to the OpenConfig Feature Profiles project ("Work") made under the Google Software Grant and Corporate Contributor License Agreement ("CLA") and governed by the Apache License 2.0. No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose. This code is provided on an "as is" basis without any warranties of any kind.</sub>

feature/lldp/ate_tests/core_lldp_tlv_population_test/README.md

@@ -17,29 +17,31 @@ Determine LLDP advertisement and reception operates correctly.
         configuration of lldp/interfaces/interface/config/enabled (TRUE or
         FALSE) on any interface.
 
-## Config Parameter coverage
-
-*   /lldp/config/enabled
-*   /lldp/interfaces/interface/config/enabled
-
-## Telemetry Parameter coverage
-
-*   /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id
-*   /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id-subtype
-*   /lldp/interfaces/interface/neighbors/neighbor/state/port-id
-*   /lldp/interfaces/interface/neighbors/neighbor/state/port-id-subtype
-*   /lldp/interfaces/interface/neighbors/neighbor/state/system-name
-*   /lldp/interfaces/interface/state/name
-*   /lldp/state/chassis-id
-*   /lldp/state/chassis-id-type
-*   /lldp/state/system-name
-
-## Protocol/RPC Parameter coverage
-
-LLDP:
-
-*   /lldp/config/enabled = true
-*   /lldp/interfaces/interface/config/enabled = true
+## OpenConfig Path and RPC Coverage
+
+The below yaml defines the OC paths intended to be covered by this test.  OC paths used for test setup are not listed here.
+
+```yaml
+paths:
+  ## Config Paths ##
+  /lldp/config/enabled:
+  /lldp/interfaces/interface/config/enabled:
+
+  ## State Paths ##
+  /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id:
+  /lldp/interfaces/interface/neighbors/neighbor/state/port-id:
+  /lldp/interfaces/interface/neighbors/neighbor/state/system-name:
+  /lldp/interfaces/interface/state/name:
+  /lldp/state/chassis-id:
+  /lldp/state/chassis-id-type:
+  /lldp/state/system-name:
+
+rpcs:
+  gnmi:
+    gNMI.Get:
+    gNMI.Set:
+
+```
 
 ## Minimum DUT platform requirement
 

feature/lldp/ate_tests/core_lldp_tlv_population_test/core_lldp_tlv_population_test.go

@@ -94,19 +94,21 @@ func TestCoreLLDPTLVPopulation(t *testing.T) {
 func configureNode(t *testing.T, name string, lldpEnabled bool) (*ondatra.DUTDevice, *oc.Lldp) {
 	node := ondatra.DUT(t, name)
 	p := node.Port(t, portName)
-	lldp := gnmi.OC().Lldp()
+	d := &oc.Root{}
+	lldp := d.GetOrCreateLldp()
+	llint := lldp.GetOrCreateInterface(p.Name())
 
-	gnmi.Replace(t, node, lldp.Enabled().Config(), lldpEnabled)
+	gnmi.Replace(t, node, gnmi.OC().Lldp().Enabled().Config(), lldpEnabled)
 
 	if lldpEnabled {
-		gnmi.Replace(t, node, lldp.Interface(p.Name()).Enabled().Config(), lldpEnabled)
+		gnmi.Replace(t, node, gnmi.OC().Lldp().Interface(p.Name()).Config(), llint)
 	}
 
 	if deviations.InterfaceEnabled(node) {
 		gnmi.Replace(t, node, gnmi.OC().Interface(p.Name()).Enabled().Config(), true)
 	}
 
-	return node, gnmi.Get(t, node, lldp.Config())
+	return node, gnmi.Get(t, node, gnmi.OC().Lldp().Config())
 }
 
 // verifyNodeConfig verifies the config by comparing against the telemetry state object.

feature/lldp/otg_tests/core_lldp_tlv_population_test/README.md

@@ -17,29 +17,31 @@ Determine LLDP advertisement and reception operates correctly.
         configuration of lldp/interfaces/interface/config/enabled (TRUE or
         FALSE) on any interface.
 
-## Config Parameter coverage
-
-*   /lldp/config/enabled
-*   /lldp/interfaces/interface/config/enabled
-
-## Telemetry Parameter coverage
-
-*   /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id
-*   /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id-subtype
-*   /lldp/interfaces/interface/neighbors/neighbor/state/port-id
-*   /lldp/interfaces/interface/neighbors/neighbor/state/port-id-subtype
-*   /lldp/interfaces/interface/neighbors/neighbor/state/system-name
-*   /lldp/interfaces/interface/state/name
-*   /lldp/state/chassis-id
-*   /lldp/state/chassis-id-type
-*   /lldp/state/system-name
-
-## Protocol/RPC Parameter coverage
-
-LLDP:
-
-*   /lldp/config/enabled = true
-*   /lldp/interfaces/interface/config/enabled = true
+## OpenConfig Path and RPC Coverage
+
+The below yaml defines the OC paths intended to be covered by this test.  OC paths used for test setup are not listed here.
+
+```yaml
+paths:
+  ## Config Paths ##
+  /lldp/config/enabled:
+  /lldp/interfaces/interface/config/enabled:
+
+  ## State Paths ##
+  /lldp/interfaces/interface/neighbors/neighbor/state/chassis-id:
+  /lldp/interfaces/interface/neighbors/neighbor/state/port-id:
+  /lldp/interfaces/interface/neighbors/neighbor/state/system-name:
+  /lldp/interfaces/interface/state/name:
+  /lldp/state/chassis-id:
+  /lldp/state/chassis-id-type:
+  /lldp/state/system-name:
+
+rpcs:
+  gnmi:
+    gNMI.Get:
+    gNMI.Set:
+
+```
 
 ## Minimum DUT platform requirement
 

feature/lldp/otg_tests/core_lldp_tlv_population_test/core_lldp_tlv_population_test.go

@@ -138,18 +138,21 @@ func TestLLDPDisabled(t *testing.T) {
 func configureDUT(t *testing.T, name string, lldpEnabled bool) (*ondatra.DUTDevice, *oc.Lldp) {
 	node := ondatra.DUT(t, name)
 	p := node.Port(t, portName)
-	lldp := gnmi.OC().Lldp()
+	d := &oc.Root{}
+	lldp := d.GetOrCreateLldp()
+	llint := lldp.GetOrCreateInterface(p.Name())
 
-	gnmi.Replace(t, node, lldp.Enabled().Config(), lldpEnabled)
+	gnmi.Replace(t, node, gnmi.OC().Lldp().Enabled().Config(), lldpEnabled)
 
 	if lldpEnabled {
-		gnmi.Replace(t, node, lldp.Interface(p.Name()).Enabled().Config(), lldpEnabled)
+		gnmi.Replace(t, node, gnmi.OC().Lldp().Interface(p.Name()).Config(), llint)
 	}
+
 	if deviations.InterfaceEnabled(node) {
 		gnmi.Replace(t, node, gnmi.OC().Interface(p.Name()).Enabled().Config(), true)
 	}
 
-	return node, gnmi.Get(t, node, lldp.Config())
+	return node, gnmi.Get(t, node, gnmi.OC().Lldp().Config())
 }
 
 func configureATE(t *testing.T, otg *otg.OTG) gosnappi.Config {