Add volume role and support setting volume owner

Add volume role
container: Use volume role, including support for user and group

roles/container/meta/argument_specs.yaml

@@ -53,6 +53,16 @@ argument_specs:
             type: bool
             required: false
             default: false
+          user:
+            description: Volume owner uid. Only applicable if mount type is volume.
+            type: str
+            required: false
+            default: ""
+          group:
+            description: Volume owner gid. Only applicable if mount type is volume.
+            type: str
+            required: false
+            default: ""
 
       container_publish_ports:
         description: "A list of published ports in docker format (<host listen address>:<host port>:<container port>)"