NFSv4: Clean up NFS4ERR_CB_PATH_DOWN error management...

Add a delegation cleanup phase to the state management loop, and do the
NFS4ERR_CB_PATH_DOWN recovery there.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 46cbc0c..84a4f52 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -43,7 +43,7 @@
 	NFS4CLNT_LEASE_EXPIRED,
 	NFS4CLNT_RECLAIM_REBOOT,
 	NFS4CLNT_RECLAIM_NOGRACE,
-	NFS4CLNT_CB_PATH_DOWN,
+	NFS4CLNT_DELEGRETURN,
 };
 
 /*