ceph: handle race between cap reconnect and cap release

When a cap get released while composing the cap reconnect message.
We should skip queuing the release message if the cap hasn't been
added to the cap reconnect message.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

diff --cc fs/ceph/caps.c
Simple merge

diff --cc fs/ceph/mds_client.c
Simple merge

diff --cc fs/ceph/mds_client.h
Simple merge