Add kombu_reconnect_delay

The amount of time to wait before attempting to reconnect
 to MQ provider. This is used in some cases where you may need to wait
 for the provider to propery premote the master before attempting to
 reconnect.

Change-Id: I1966d9b018d056ccfe6c6346e42c4cf0ff01caa2
closes-bug: #1340310