Updated openstack/openstack
Project: openstack/cinder  f028c8ac509acac69f29323fd9fefea143693a75
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Remove old driver mapping deprecation

This deprecation was introduced back in Grizzly, which will be EOL after
IceHouse. Removing to clean things up.

Change-Id: I509bb4115c3c88a7af7326125feb760f20847b8d