ceph_pool: refact exec_commands()
ceph_pool: refact exec_commands()

We never multiple ceph command at a time, so there's no need to have this design.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible