Add manifest for pdu cold reboot related jobs

To prevent the job from being executed unintentionally.

contrib/checkbox-ce-oem/checkbox-provider-ce-oem/units/power-management/jobs.pxu

@@ -16,6 +16,8 @@ _description:
         STRESS_BOOT_WAIT_DELAY=60
 unit: job
 plugin: shell
+imports: from com.canonical.plainbox import manifest
+requires: manifest.has_pdu == 'True'
 command:
     sleep 5
     [[ -z "$STRESS_BOOT_WAKEUP_DELAY" ]] && STRESS_BOOT_WAKEUP_DELAY=60
@@ -32,5 +34,7 @@ _summary: Post cold reboot service check
 _description: Check there are no failed services after the cold reboot
 unit: job
 plugin: shell
+imports: from com.canonical.plainbox import manifest
+requires: manifest.has_pdu == 'True'
 command: reboot_check_test.sh -s
 estimated_duration: 1.0

contrib/checkbox-ce-oem/checkbox-provider-ce-oem/units/power-management/manifest.pxu

@@ -0,0 +1,4 @@
+unit: manifest entry
+id: has_pdu
+_name: Does network PDU available in test environment?
+value-type: bool

contrib/checkbox-ce-oem/checkbox-provider-ce-oem/units/stress/boot.pxu

@@ -5,6 +5,8 @@ _description: This creates baseline data sets which be considered the master
  copies and all further tests will be compared against these.
 unit: job
 plugin: shell
+imports: from com.canonical.plainbox import manifest
+requires: manifest.has_pdu == 'True'
 command:
     reboot_check_test.sh -d "$PLAINBOX_SESSION_SHARE/before_reboot"
 environ: LD_LIBRARY_PATH