cephadm-adopt: use ceph_osd_flag module
cephadm-adopt: use ceph_osd_flag module

There's no reason to not use the ceph_osd_flag module to set/unset osd
flags.
Also if there's no OSD nodes in the inventory then we don't need to
execute the set/unset play.

Signed-off-by: Dimitri Savineau <a50a620e679eed14f4e99998b821cea8884cf228@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible