Remove kolla_config copy from keystone service.

Remove kolla_config copy from keystone service.

Simplify the config of the keystone service by mounting in the
configurations instead of specifying them all in kolla config.

This is change is useful to limit the side effects of generating the
config files and running the container is two separate steps as config
directories are now bind-mounted inside the container instead of having
files being copied to the container. We've seen examples of Apache's
mod_ssl configuration file present on the container preventing it to
start when puppet configured apache not to load the ssl module (in case
TLS is disabled).

Co-Authored-By: Martin André <m.andre@redhat.com>
Change-Id: Ie33ffc7c2b1acf3e4e505d38efb104bf013f2ce6