ceph-facts: fix read osd pool default crush fact

ceph-facts: fix read osd pool default crush fact

We don't need to use run_once on that task when having running monitors
otherwise the read task could be skip and the set task will fail.

The conditional check 'crush_rule_variable.rc == 0' failed. The error
was: error while evaluating conditional (crush_rule_variable.rc == 0):
'dict object' has no attribute 'rc'

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1898856
Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>