updated code to fetch availability zone info into hostvars (#243)

* updated code to fetch availability zone info into hostvars

* updated documentation part for availability_zone property

Co-authored-by: haiyuan_zhang <haiyuan.zhang1982@gmail.com>

plugins/inventory/azure_rm.py

@@ -100,6 +100,7 @@
 # resource_type: the VM's resource type, eg: 'Microsoft.Compute/virtualMachine', 'Microsoft.Compute/virtualMachineScaleSets/virtualMachines'
 # vmid: the VM's internal SMBIOS ID, eg: '36bca69d-c365-4584-8c06-a62f4a1dc5d2'
 # vmss: if the VM is a member of a scaleset (vmss), a dictionary including the id and name of the parent scaleset
+# availability_zone: availability zone in which VM is deployed, eg '1','2','3'
 
 
 # sample 'myazuresub.azure_rm.yaml'
@@ -538,6 +539,9 @@ def hostvars(self):
                 system = 'linux'
             if osType == 'Windows':
                 system = 'windows'
+        av_zone = None
+        if 'zones' in self._vm_model:
+            av_zone = self._vm_model['zones']
 
         new_hostvars = dict(
             public_ipv4_addresses=[],
@@ -546,6 +550,7 @@ def hostvars(self):
             id=self._vm_model['id'],
             location=self._vm_model['location'],
             name=self._vm_model['name'],
+            availability_zone=av_zone,
             powerstate=self._powerstate,
             provisioning_state=self._vm_model['properties']['provisioningState'].lower(),
             tags=self._vm_model.get('tags', {}),