Mark XML API as deprecated in Mitaka.
Mark XML API as deprecated in Mitaka.

Cinder XML API is untested and will be removed in the N release.

Implements: blueprint deprecate-xml-api
Change-Id: I753dedadf99bbb8e49d0076aa0da4ffa4ff97a4b

apporc/cinder,openstack/cinder,j-griffith/cinder,mahak/cinder,Nexenta/cinder,cloudbase/cinder,j-griffith/cinder,phenoxim/cinder,NetApp/cinder,bswartz/cinder,eharney/cinder,dims/cinder,apporc/cinder,NetApp/cinder,ge0rgi/cinder,Hybrid-Cloud/cinder,phenoxim/cinder,scality/cinder,scality/cinder,cloudbase/cinder,Hybrid-Cloud/cinder,openstack/cinder,Datera/cinder,Datera/cinder,eharney/cinder,dims/cinder,mahak/cinder,Nexenta/cinder,bswartz/cinder