Add support for deprecated configuration vars in Juno

Just like the beginning of every other release, remove the deprecated
config option aliases that were marked as deprecated in Icehouse.

Nova patch - https://review.openstack.org/#/c/88456/

Change-Id: Idd051c516002030e8e191c7b8d31f1ff408e1c7d
Merge "Add support for deprecated configuration vars in Juno"