In our use case we might only be configuring mons and not osds in the
same call, so we don't want to check variables needed for osds when they
are not needed to configure a mon.
Signed-off-by: Andrew Schoen <aschoen@redhat.com>
Fix the logic for the mandatory devices check so that it applies to
raw_multi_journal and journal_collocation scenarios separately.
This fails otherwise because whichever var is "first" in the or is most
likely undefined.