Try to ensure FQDN of host is collected

Not all systems are required to have the generic hostname command return
the FQDN. We have encountered customers who require the a short name by
default. Adding the "-f" output helps to get that information.

Signed-off-by: Peter Portante <peter.portante@redhat.com>
Signed-off-by: Bryn M. Reeves <bmr@redhat.com>