1114132: subman-gui and other tools are disabled in container mode.

The following list of tools have been made to write "[tool name] is disabled when running inside a container. Please refer to your host system for subscription management.\n" to stderr and exit(-1):
- subscription-manager-gui
- rhsmcertd
- rhn-migrate-classic-to-rhsm

bz: https://bugzilla.redhat.com/show_bug.cgi?id=1114132