BZ1158704 - Broker fails to create HA DNS entry for HA app

* If the ha parameter is passed as part of the application creation api,
* the broker was not adding the pending operation to create the routing
* dns. After adding this patch, the routing DNS record is created if and
* only if the broker.conf is set to manage the external routing DNS.
Merge pull request #5956 from calfonso/bz1158704

Merged by openshift-bot