Add ca-disable and ca-enable commands
We soon plan to revoke certificates upon lightweight CA deletion.
This makes it important to provide a way to prevent a CA from
issuing certificates whilst not deleting and revoking it, and
continuing to allow management of issued certs.
This commit adds the ca-disable and ca-enable commands.
Fixes: https://fedorahosted.org/freeipa/ticket/6257
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>