Updated openstack/openstack
Project: openstack/oslo.messaging  2b9bafd269a34c2e0b434adf3331fa67b35b5a6d
null
Simplify common base exception prototype

It seems there's no gain in trying to be smarter and different from the
base Python Exception, so let's remove our custom code to be more
compatible and friendly with all Python versions.

Change-Id: I259783ef1f77c6661ea7dc2325605c8d6290b898
Updated openstack/openstack
Project: openstack/oslo.messaging  fda06f68062fcd81817a48e0f8ad2fd1139a59dc
null
Remove useless global vars / import

This removes a few import and global variables that are not used through
the code. That cleans things a little.

Change-Id: I7b30bb11e8ad3c2df01ca2107eff2444feed3fe2