Add a drop config-grp command in update instance1.0.6

As per the current code in the client, there is no option to detach
the configuration group of the instance. This change gives a user the
option to explicitly drop the config group of the instance as part of
the instance update call.

Change-Id: I7defd110549df87afd267d3ebe998904ff6b7483
Closes-Bug: 1359359

2 files changed, 13 insertions, 3 deletions

diff --git a/troveclient/v1/instances.py b/troveclient/v1/instances.py
index ab33686..f667654 100644
--- a/troveclient/v1/instances.py
+++ b/troveclient/v1/instances.py
@@ -94,11 +94,16 @@ class Instances(base.ManagerWithFind):
         common.check_for_exceptions(resp, body, url)
 
     def edit(self, instance_id, configuration=None, name=None,
-             detach_replica_source=False):
+             detach_replica_source=False, remove_configuration=False):
         body = {
             "instance": {
             }
         }
+        if configuration and remove_configuration:
+            raise Exception("Cannot attach and detach configuration "
+                            "simultaneosly.")
+        if remove_configuration:
+            body["instance"]["configuration"] = None
         if configuration is not None:
             body["instance"]["configuration"] = configuration
         if name is not None:
diff --git a/troveclient/v1/shell.py b/troveclient/v1/shell.py
index 595f4b5..a33b145 100644
--- a/troveclient/v1/shell.py
+++ b/troveclient/v1/shell.py
@@ -184,12 +184,17 @@ def do_delete(cs, args):
            dest='detach_replica_source',
            action="store_true",
            default=False,
-           help='Detach the replica instance from its replication source .')
+           help='Detach the replica instance from its replication source.')
+@utils.arg('--remove_configuration',
+           dest='remove_configuration',
+           action="store_true",
+           default=False,
+           help='Drops the current configuration reference.')
 @utils.service_type('database')
 def do_update(cs, args):
     """Updates an instance: Edits name, configuration, or replica source."""
     cs.instances.edit(args.instance, args.configuration, args.name,
-                      args.detach_replica_source)
+                      args.detach_replica_source, args.remove_configuration)
 
 
 @utils.arg('name',