Clean out config deprecation information
Clean out config deprecation information

Nova settings were deprecated, then removed in change
Ic112a68101c0dcb14da0db06c62ae190474a37d9. Some legacy
info was left behind in one of the new options referring
to the old config setting that should now be removed.

Change-Id: I031e5ffbc11c4b044f3baf808d852ce871a2d6c5

phenoxim/cinder,openstack/cinder,mahak/cinder,openstack/cinder,mahak/cinder,phenoxim/cinder,j-griffith/cinder,j-griffith/cinder