Updated openstack/openstack
Project: openstack/requirements  0ed0c8eb7f5c1007f134cab42aa98b6ccb3045e0

Update oslo.messaging to 1.4.0.0a3

This oslo.messaging version fixes a problem with encoding
issue in source file(review 102909), causing some Neutron
gate test failures (e.g. 102351). Using a3, since it is the
latest.

Change-Id: I673b5d505c8b7d43d59f7516e345f92221483a51