stop.sh: indent 4 spaces universally

Currently there is a mix between tabs and 4 spaces indent.  Switch to
4 spaces indent.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
stop.sh: do not trace commands

Command tracing here doesn't bring any value and simply pollutes the
terminal, as the script always runs to completion.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
stop.sh: unmap rbd images when stopping the whole cluster

Unmap rbd images when stopping the whole cluster.  Not doing so results
in images that cannot be unmapped until the same cluster is brought
back up.  Issue a warning if we failed to unmap all images.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Merge pull request #1596 from ceph/wip-vstop-unmap

Unmap rbd images when stopping the whole cluster

Reviewed-by: Sage Weil <sage@inktank.com>