Ensure that qpid connection is closed (from oslo)

This is commit a9bc62814d in oslo-incubator

Fixes bug 1172922

When reestablishing a session and a connection already exists the
existing connection will be closed prior to opening the new one.

Change-Id: I9a25800fe4b56eba89d550e3461ce095bf902f0a

cinder/openstack/common/rpc/impl_qpid.py

@@ -331,15 +331,16 @@ def _lookup_consumer(self, receiver):
 
     def reconnect(self):
         """Handles reconnecting and re-establishing sessions and queues"""
-        if self.connection.opened():
-            try:
-                self.connection.close()
-            except qpid_exceptions.ConnectionError:
-                pass
-
         attempt = 0
         delay = 1
         while True:
+            # Close the session if necessary
+            if self.connection.opened():
+                try:
+                    self.connection.close()
+                except qpid_exceptions.ConnectionError:
+                    pass
+
             broker = self.brokers[attempt % len(self.brokers)]
             attempt += 1