enable dms instance delete in cli (#499)

enable dms instance delete in cli

Enable feature

Reviewed-by: RusselSand

Author: anton-sidelnikov

setup.cfg

@@ -216,6 +216,7 @@ openstack.dms.v1 =
   dms_instance_list = otcextensions.osclient.dms.v1.instance:ListDMSInstance
   dms_instance_show = otcextensions.osclient.dms.v1.instance:ShowDMSInstance
   dms_instance_create = otcextensions.osclient.dms.v1.instance:CreateDMSInstance
+  dms_instance_delete = otcextensions.osclient.dms.v1.instance:DeleteDMSInstance
   dms_instance_set = otcextensions.osclient.dms.v1.instance:UpdateDMSInstance
   dms_instance_restart = otcextensions.osclient.dms.v1.instance:RestartDMSInstance
   dms_instance_topic_list = otcextensions.osclient.dms.v1.topic:ListDMSInstanceTopic