Updated openstack/openstack
Project: openstack/oslo.messaging  270e9cb00c634d4e232ecb518c96395e0c115cf3

Remove duplicate docs for MessageHandlingServer

We're currently including these docs under the RPC server and
notification listener sections causing sphinx to have a minor panic
attack.

  WARNING: duplicate object description of oslo.messaging.MessageHandlingServer

Change-Id: I76a4d9a7f55f7b65bcdd2bdb814904dc55bd1068