Improve service validation during upgrade Manila

  * Added modules which allows to check and manage services statuses.
  * Added states which allows enable/disable one/all services by host name.

Change-Id: I078d089b221180ff2355087bc0601f904f8dbd94
Related-PROD: PROD-25158
diff --git a/_modules/manilang/__init__.py b/_modules/manilang/__init__.py
index 4d0b401..d8b7f90 100644
--- a/_modules/manilang/__init__.py
+++ b/_modules/manilang/__init__.py
@@ -21,18 +21,21 @@
     REQUIREMENTS_MET = False
 
 from manilang import share_types
+from manilang import services
 
 list_share_types = share_types.list_share_types
 create_share_type = share_types.create_share_type
 set_share_type_extra_specs = share_types.set_share_type_extra_specs
 unset_share_type_extra_specs = share_types.unset_share_type_extra_specs
 delete_share_type = share_types.delete_share_type
-
+service_list = services.service_list
+service_update = services.service_update
+service_wait = services.wait_for_service
 
 __all__ = (
     'list_share_types', 'create_share_type',
     'set_share_type_extra_specs', 'unset_share_type_extra_specs',
-    'delete_share_type',
+    'delete_share_type','service_list', 'service_update', 'service_wait',
 )