ceph: return error code when failing to get result from admin socket

Make sure we return a non-zero result code when we fail to read something
from the admin socket.

Backport: cuttlefish, bobtail
Signed-off-by: Sage Weil <sage@inktank.com>
OSD: snap collections can be ignored on split

Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
PG: clear snap_collections on upgrade

Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
OSD: handle stray snap collections from upgrade bug

Previously, we failed to clear snap_collections, which causes split to
spawn a bunch of snap collections.  In load_pgs, we now clear any such
snap collections and then snap_collections field on the PG itself.

Related: #4927
Signed-off-by: Samuel Just <sam.just@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Merge branch 'wip_split_upgrade' into next

Fixes: #4927
init-ceph: fix osd_data location when checking df utilization

Do not assume default osd data location.

Fixes: #4951
Backport: cuttlefish, bobtail
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Gary Lowelll <gary.lowell@inktank.com>
ceph-create-keys: gracefully handle no data from admin socket

Old ceph-mon (prior to 393c9372f82ef37fc6497dd46fc453507a463d42) would
return an empty string and success if the command was not registered yet.
Gracefully handle that case by retrying.

If we still fail to parse, exit entirely with EINVAL.

Fixes: #4952
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Dan Mick <dan.mick@intank.com>
debian/control:  squeeze requres cryptsetup package

Squeeze requires the cryptsetup package which has been renamed
cryptsetup-bin in later versions.  Allow either package to
satisfy the dependency.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
(cherry picked from commit 83bbae415de16f708ca1cb24861ddbb0bd514a7f)
common/Preforker: fix warnings

Signed-off-by: Sage Weil <sage@inktank.com>
mon: allow leveldb logging

'mon leveldb log = filename'

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit c1d5f815546b731e10bfcb81cbcd48b7d432e9c4)
osd: optionally enable leveldb logging

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 0b4c5c1a3349670d11cc3c4fb3c4b3c1a80b2502)
mon: dump MonitorDBStore transactions to file

Signed-off-by: Samuel Just <sam.just@inktank.com>
(cherry picked from commit 797089ef082b99910eebfd9454c03d1f027c93bb)
Merge remote-tracking branch 'gh/next'

Conflicts:
	src/mon/MonitorDBStore.h