mon: debug propagate_snaps_to_tiers

Signed-off-by: Sage Weil <sage@inktank.com>
osd: fix propagation of removed snaps to other tiers

When we update removed_snaps we do not update snap_seq.  Drop this broken
optimization.

Signed-off-by: Sage Weil <sage@inktank.com>
osd/OSDMonitor: fix 'osd tier add ...' pool mangling

Signed-off-by: Sage Weil <sage@inktank.com>
Merge pull request #1072 from ceph/wip-tier-snap

Reviewed-by: Greg Farnum <greg@inktank.com>