message: Add "Pending" to LabProperties status
  Add "Pending" to LabProperties status, an extensible enum
diff: "description": "The status of this lab",
  "enum": [
  "Active",
  - "Deleted"
  + "Deleted",
  + "Pending"
  ],
  "x-ms-enum": {
  "name": "LabStatus",
  