Add support to enable ssl keystone config

Currently there is no easy way to pass in enable ssl
and set the ssl options in keystone config. This
should expose the options to be set as part of
the ssl config in keystone.

Change-Id: Idb63406a90d8b1072e6781f820e62633aeb3bac7
(Cherry picked from b1603846cb6bd87df63bd409aef3336d5e139aed )