tools: No install-time dependency on realmd
tools: No install-time dependency on realmd

Some systems like Atomic don't include realmd, and would rather
join doimains in other ways (TBD) ... so just disable those options
when realmd isn't present.

Closes #2113
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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