Checks if Dir Server is installed and running before IPA installation
In cases when IPA is installed in two steps (external CA), it's
necessary to check (in the second step) if Dir. Server is
running before continue with the installation. If it's not,
start Directory Server.
https://pagure.io/freeipa/issue/6611
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>