Users may now provide domain_name in the ksgen settings file (along with
setting the correct and respective hostnames). This domain name will be
used for all of the deployed machines.
JIRA: BGS-86
Change-Id: I34b6da07dd565648399ea7a1abf2abe1ae62d91a Signed-off-by: Tim Rozet <trozet@redhat.com>