Set QPID_HOST parameter to better support multi-node mode

When deploying OpenStack in a multi-node configuration,
the Qpid clients need the hostname of the potentially
remote Qpid server in order to permit the necessary RPC
communication between components.

Fixes bug #1196521

Change-Id: Iee3c3747cedea9488ec345e78f8eddbc6e850573
Merge "Set QPID_HOST parameter to better support multi-node mode"