rolling update: stop OSDs before upgrading
rolling update: stop OSDs before upgrading

This avoids a bug where OSDs are sometimes restarted twice on
upgrades which leaves the OSD process running but not marked up.

See:

https://bugzilla.redhat.com/show_bug.cgi?id=1394928
https://bugzilla.redhat.com/show_bug.cgi?id=1391675
https://bugzilla.redhat.com/show_bug.cgi?id=1394929

Signed-off-by: Andrew Schoen <aschoen@redhat.com>

Resolves: rhbz#1394929

albertomurillo/ceph-ansible,WingkaiHo/ceph-ansible,font/ceph-ansible,WingkaiHo/ceph-ansible,albertomurillo/ceph-ansible,jtaleric/ceph-ansible,guits/ceph-ansible,jsaintrocc/ceph-ansible,travmi/ceph-ansible,jsaintrocc/ceph-ansible,travmi/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,guits/ceph-ansible,fgal/ceph-ansible,WingkaiHo/ceph-ansible,jtaleric/ceph-ansible,ceph/ceph-ansible,bengland2/ceph-ansible,font/ceph-ansible,albertomurillo/ceph-ansible,bengland2/ceph-ansible