Updated openstack/openstack
Project: openstack/oslo.messaging  5912b58233a795d5c6e6a377441c609f15634cb0
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Add 'warning' as an alias to 'warn'

The standard Python logging system uses 'warning' and not 'warn'. To
ease compatibility with it, let's add 'warning' too.

Change-Id: I7778d7960ca7a72be007cb083e5434ede6e3fe6e