Fix rabbitmq env file name and log path

Proper filename for setting env vars is rabbitmq-env.conf, otherwise
rabbitmqctl is not able to connect to the server on newly deployed
undercloud or overcloud.

Change-Id: I53b3df2fbe0f3da976b32dbeed9a6277fd1c38bc
Update openstack config files to support rabbitmq cluster

Change-Id: I178b861a22813154df584502eee145b6474d4573
Merge "Fix rabbitmq env file name and log path"
Merge "Update openstack config files to support rabbitmq cluster"