when starting an OSD, pass in the cluster name

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
use  name in /var/lib/ceph paths

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
use cluster name when checking the host

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
allow passing a --cluster flag to the init script

It will fallback to looking at /etc/ceph/$cluster.conf
otherwise.

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
make ceph-disk use the new init flag for cluster

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
init-ceph: conditionally update  after argparsing

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge branch 'wip-8860'

Reviewed-by: Sage Weil <sage@redhat.com>