Add new setup commands for token keys
Add new setup commands for token keys

This change adds new token_setup and token_rotate commands that uses the
same functionality as fernet_setup and fernet_rotate. These commands are
to move users to a more generic use case.

Change-Id: I118f9a89d28d8ec1ccaf88a90053fa723ef98cff

mahak/keystone,mahak/keystone,mahak/keystone,openstack/keystone,openstack/keystone,openstack/keystone