This PS removes the pregenerated config templates producing using
the hacked oslo-genconfig tool. This results in both a much smaller
codebase and also more readable configuration by removing the
requirement to specify settings via oslo namespaced references.
This initial PS applies only to Keystone, A follow up will extend to
all remaining services.
Partially implements: blueprint remove-pregenerated-config-templates
See: https://blueprints.launchpad.net/openstack-helm/+spec/remove-pregenerated-config-templates
Change-Id: I3ced7ad02c703c767925a17b1a18f6158a878e83
5e8be5c339