Fixed the defect that closing call come in and change the NFS state just before
open call return handle index to client. The fix will call fast open which is
protected by mutex before return handle index to client.

Signed-off-by: huangz <huangz@us.ibm.com>
Commit for pt v4.1 rev_9

Signed-off-by: Allison Henderson <achender@vnet.linux.ibm.com>
Merge branch 'tp/huangz_14622_rev8' into ibm_next_tmp
Merge branch 'tp/pt_rev9' into ibm_next_tmp