Fix use of new openstacksdk connection

We store the created conn on the instance, but we never pull it back off
if there is already one present.

Change-Id: I2d890dd206d4ddf67fa42d798e6fd2c652799785

Author: emonty

openstackclient/network/client.py

@@ -67,6 +67,7 @@ def make_client(instance):
 
         instance.sdk_connection = conn
 
+    conn = instance.sdk_connection
     LOG.debug('Connection: %s', conn)
     LOG.debug('Network client initialized using OpenStack SDK: %s',
               conn.network)