msg: fix entity_addr_t::is_same_host() for IPv6

We weren't checking the memcmp return value properly!  Aie...

Backport: bobtail
Signed-off-by: Sage Weil <sage@inktank.com>
librbd: fix rollback size

The duplicate calls to get_image_size() and get_snap_size() replaced
by 5806226cf0743bb44eaf7bc815897c6846d43233 uncovered this. The first
call was using the currently set snap_id instead of the snapshot being
rolled back to.

Fixes: #4272
Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
ceph-test.install:  Add libcephfs-test.jar.

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Merge branch 'next'