Support for azure-mgmt-recoveryservicesbackup v4.0+ (#1469)

In newer versions of the library, the models module got split between
two sub-packages, `passivestamp` and `activestamp`. All models used are
part of the `activestamp` module, so conditionally import from there if
the newer version is installed.

plugins/module_utils/azure_rm_common.py

@@ -271,7 +271,11 @@ def default_api_version(self):
     from azure.mgmt.iothub import models as IoTHubModels
     from azure.mgmt.resource.locks import ManagementLockClient
     from azure.mgmt.recoveryservicesbackup import RecoveryServicesBackupClient
-    import azure.mgmt.recoveryservicesbackup.models as RecoveryServicesBackupModels
+    try:
+        #  Older versions of the library exposed the modules at the root of the package
+        import azure.mgmt.recoveryservicesbackup.models as RecoveryServicesBackupModels
+    except ImportError:
+        import azure.mgmt.recoveryservicesbackup.activestamp.models as RecoveryServicesBackupModels
     from azure.mgmt.search import SearchManagementClient
     from azure.mgmt.datalake.store import DataLakeStoreAccountManagementClient
     import azure.mgmt.datalake.store.models as DataLakeStoreAccountModel