Add option to realm command to only print out realm name
Add option to realm command to only print out realm name

When --name-only is specified only print out the name of the realm
and not all the detailed info.

https://bugs.freedesktop.org/show_bug.cgi?id=55415

freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd