[Communication] - Identity/TURN - Update TURN response to use array of urls (Azure#13157)

* update Identity and Turn swaggers to use common definition of CommunicationErrorResponse type

* Update Turn swagger to use definitions from CommunicationIdentity swagger

* update CommunicationIdentity to preview version to match with CommunicationTurn swagger

* update readme file with preview version of CommnicationIdentity.json

* add examples for CommunicationIdentity

* update urls in TURN response to be an array

Co-authored-by: Avin Pattath <[email protected]>

Author: apattath

specification/communication/data-plane/Microsoft.CommunicationServicesTurn/preview/2021-02-22-preview1/CommunicationTurn.json

@@ -61,8 +61,11 @@
       "type": "object",
       "properties": {
         "urls": {
-          "description": "URL of the server.",
-          "type": "string"
+          "description": "List of TURN server URLs.",
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
         },
         "username": {
           "description": "User account name which uniquely identifies the credentials.",

specification/communication/data-plane/Microsoft.CommunicationServicesTurn/preview/2021-02-22-preview1/examples/IssueTurnCredentials.json

@@ -10,7 +10,9 @@
       "body": {
         "turnServers": [
           {
-            "urls": "turn:131.107.255.255:3478",
+            "urls": [
+              "turn:131.107.255.255:3478"
+            ],
             "username": "AgAAJNOeygwB1uVGvuwAVMHV4PLhYDgY66Fg1dUZvQ4AAAAEhXrhc8uJFjOK8lxEsZk3KIpWxc0=",
             "credential": "9rl8ablFWj6/aqSuPLgLykLZKqw="
           }