DNS: Reinitialize DNS resolver after changing resolv.conf
Previously the installer did not reinitialize resolver so queries for
records created using --ip-address option might not be answered. This led
to incorrect results during 'Updating DNS system records' phase at the
end of installation.
This is kind of hack but right now we do not have enough time to extend
python-dns's interface with resolver_reinit() method.
https://fedorahosted.org/freeipa/ticket/5962
Reviewed-By: Martin Basti <mbasti@redhat.com>