project field can now list project names

If `CeilometerEnableTenantDiscovery` is enabled, ceilometer samples
will contain `project_name` field, values from which are populated
in `project` field.

This change affects 2 dashboards, 'Cloud View' and 'Virtual Machine View',
only these allow switching between openstack projects.

If samples are missing `project_name` field, the regex for `project`
variable allows fallback to `project` field

roles/servicetelemetry/files/rhos-cloud-dashboard.json

@@ -1462,7 +1462,7 @@
           "value": "$__all"
         },
         "datasource": "STFPrometheus",
-        "definition": "label_values(ceilometer_cpu{service=~\".+-$clouds-.+\"},project)",
+        "definition": "ceilometer_cpu{service=~\".+-$clouds-.+\"}",
         "description": null,
         "error": null,
         "hide": 2,
@@ -1472,11 +1472,11 @@
         "name": "projects",
         "options": [],
         "query": {
-          "query": "label_values(ceilometer_cpu{service=~\".+-$clouds-.+\"},project)",
+          "query": "ceilometer_cpu{service=~\".+-$clouds-.+\"}",
           "refId": "StandardVariableQuery"
         },
         "refresh": 2,
-        "regex": "",
+        "regex": "/project_name=\"(?<text>[^\"]+)|project=\"(?<value>[^\"]+)/g",
         "skipUrlSync": false,
         "sort": 0,
         "tagValuesQuery": "",

roles/servicetelemetry/files/virtual-machine-view.json

@@ -1062,7 +1062,7 @@
       {
         "allValue": null,
         "datasource": null,
-        "definition": "label_values(ceilometer_cpu{service=~\".+-$clouds-.+\"}, project)",
+        "definition": "ceilometer_cpu{service=~\".+-$clouds-.+\"}",
         "description": null,
         "error": null,
         "hide": 0,
@@ -1072,11 +1072,11 @@
         "name": "project",
         "options": [],
         "query": {
-          "query": "label_values(ceilometer_cpu{service=~\".+-$clouds-.+\"}, project)",
+          "query": "ceilometer_cpu{service=~\".+-$clouds-.+\"}",
           "refId": "StandardVariableQuery"
         },
         "refresh": 1,
-        "regex": "",
+        "regex": "/project_name=\"(?<text>[^\"]+)|project=\"(?<value>[^\"]+)/g",
         "skipUrlSync": false,
         "sort": 0,
         "tagValuesQuery": "",