mon: remember osd weight when auto-marking osds out

If we automatically mark an OSD out, remember its OSD weight.

Signed-off-by: Sage Weil <sage@inktank.com>
mon: restore previous weight when auto-marked out osd boots

When an OSD that was marked out boots, restore the weight it had before.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #1813 from ceph/wip-old-out

mon: restore osd weight after auto-mark out and then osd restart

Reviewed-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Loic Dachary <loic@dachary.org>