Updated openstack/openstack
Project: openstack/oslo.messaging  991cf147269cd00251b64a5aeb9d8923702c81d7

Set sample_default for rpc_zmq_host

oslo-config-generator will use the sample_default for the sample
config file rather than the hostname of the system it happens to
be running on.

Change-Id: I9c7bf24cfe5c66155d00d9a1b390894d1ccb6bd8