osd: skip some set_fact when osd_scenario=lvm
osd: skip some set_fact when osd_scenario=lvm

these tasks are not needed when using `osd_scenario: lvm`

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1509230

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

travmi/ceph-ansible,font/ceph-ansible,font/ceph-ansible,ceph/ceph-ansible,fgal/ceph-ansible,fgal/ceph-ansible,travmi/ceph-ansible,ceph/ceph-ansible