Updated openstack/openstack
Project: openstack/oslo.messaging  ac74be3c80b47425384b38337d831d58771e2ec9

Improve help strings

Follow oslo.config conventions for consistency of help strings:
* Use sentence style capitalization.
* End entry with a "."
Fix capitalization of AMQP.

Change-Id: I0a6b170a2a7cfa539e06781f4495c4353d22e4d0