mds: include inode version in auth mds' lock messages

mds: include inode version in auth mds' lock messages

encode inode version in auth mds' lock messages, so that version
of replica inodes get updated. This is important because client
use inode version in mds reply to check if the cached inode is
already up-to-date. It skips updating the inode if it thinks the
inode is already up-to-date.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>