Add availability zones to azure_rm_virtualmachine_info module

fixes #522

plugins/modules/azure_rm_virtualmachine_info.py

@@ -234,6 +234,10 @@
             returned: always
             type: str
             sample: Standard_D4
+        zones:
+            description:
+                - A list of Availability Zones for your VM.
+            type: list
         power_state:
             description:
                 - Power state of the virtual machine.
@@ -386,6 +390,7 @@ def serialize_vm(self, vm):
         new_result['state'] = 'present'
         new_result['location'] = vm.location
         new_result['vm_size'] = result['properties']['hardwareProfile']['vmSize']
+        new_result['zones'] = result['zones']
         os_profile = result['properties'].get('osProfile')
         if os_profile is not None:
             new_result['admin_username'] = os_profile.get('adminUsername')