Ensure that readonly result members are serialized (#33170)

* fix for breaking metadata change in various Azure Python SDK bits; some members were marked `readonly` for validation, which the default msrest serializer ignores. Added `keep_readonly` flag to serializer call to ensure they're preserved.
(cherry picked from commit 70e351036d)

CHANGELOG.md

@@ -188,6 +188,8 @@ Ansible Changes By Release
   https://github.com/ansible/ansible/pull/32990
 * Fix for breaking change to Azure Python SDK DNS RecordSet constructor in azure-mgmt-dns==1.2.0
   https://github.com/ansible/ansible/pull/33165
+* Fix for breaking change to Azure Python SDK that prevented some members from being returned in facts modules
+  https://github.com/ansible/ansible/pull/33169
 
 <a id="2.4.1"></a>
 

lib/ansible/module_utils/azure_rm_common.py

@@ -508,7 +508,7 @@ class AzureRMModuleBase(object):
             self.log("dependencies: ")
             self.log(str(dependencies))
         serializer = Serializer(classes=dependencies)
-        return serializer.body(obj, class_name)
+        return serializer.body(obj, class_name, keep_readonly=True)
 
     def get_poller_result(self, poller, wait=5):
         '''