Check for consumers before draining events
Check for consumers before draining events

If the AMQP client proceeds with draining events without having any consumers
that could delay the consumer creation and loss of messages

Change-Id: Iead3a471cc97997c7da51bf8cc4252a3ad1e3fa7
closes-jira-bug: JCB-218915

rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller