upgrade: skip luminous tasks for jewel minor update
upgrade: skip luminous tasks for jewel minor update

These tasks are needed only when upgrading to luminous.
They are not needed in Jewel minor upgrade and by the way, they fail because
`ceph versions` command doesn't exist.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1535382

(cherry picked from commit c7ec12d49ca3c3f936f4c7a34ef15c042ab0f699)
Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

fgal/ceph-ansible,fgal/ceph-ansible