libcephfs: add ceph_get_osd_addr interface

Return the network address for an OSD by ID.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Merge remote-tracking branch 'origin/wip-osd-addr-api'

Reviewed-by: Sage Weil <sage@inktank.com>
rados/test.sh fails in the nightly run

Make test more robust by using my_snaps vector for snap IDs

Signed-off-by: David Zafman <david.zafman@inktank.com>
ceph-disk-activate: abort if target position is already mounted

If the target position is already a mount point, fail to move our mount
over to it.  This usually indicates that a different osd.N from a
different cluster instances is in that position.

Signed-off-by: Sage Weil <sage@inktank.com>
Merge git://github.com/ceph/ceph