Fix rabbitmqctl cluster_name regexp extractor
Fix rabbitmqctl cluster_name regexp extractor

rabbitmqctl outputs can be multilined if some
strings are too long, thus breaking the grep regexp.
This can happen if container's hostname is too long.

This patch inlines the rabbitmqctl output before
matching the regexp

Change-Id: I2a1adb2b6c60cae1c5b6b289cc938c26c0ef12bd
Closes-Bug: #1773394
Signed-off-by: parasitid <e80c2d8f268a6fea31b95f5b0ad73f777818f2a0@yahoo.fr>

openstack/openstack-ansible-rabbitmq_server,openstack/openstack-ansible-rabbitmq_server