Docker: rm container before retry of ceph osd prepare
Docker: rm container before retry of ceph osd prepare

In addition to `196fa7e` this commit check if a container has been
already launched and delete it before retrying the ceph osd prepare
process.

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

jtaleric/ceph-ansible,font/ceph-ansible,bengland2/ceph-ansible,jtaleric/ceph-ansible,fgal/ceph-ansible,bengland2/ceph-ansible,ceph/ceph-ansible,font/ceph-ansible,travmi/ceph-ansible,fgal/ceph-ansible,travmi/ceph-ansible,ceph/ceph-ansible