Branch HEAD

Branch HEAD
b=20642
i=zhen.liang
i=alexander.zarochentsev

fix for already freed rs object access in commit_replies:
1 . Introduce rs->rs_committed flag to indicate that commit_replies() has done
  all access to the rs object.
2. check rs->rs_committed instead of list_empty_careful() to sure that
   commit_replies does not access the rs object in parallel with
   ptlrpc_handle_rs and it is safe not to use exp_uncommitted_replies_lock.