NFS: Add a mount option to specify number of TCP connections to use

Allow the user to specify that the client should use multiple connections
to the server. For the moment, this functionality will be limited to
TCP and to NFSv4.x (x>0).

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/internal.h

@@ -123,6 +123,7 @@ struct nfs_parsed_mount_data {
 		char			*export_path;
 		int			port;
 		unsigned short		protocol;
+		unsigned short		nconnect;
 	} nfs_server;
 
 	void			*lsm_opts;