ocfs2: bump up o2cb network protocol version

ocfs2: bump up o2cb network protocol version

Two new messages are added to support negotiating hb timeout.  Stop
nodes frmo talking an old version to mount as they will cause the
negotiation to fail.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Junxiao Bi <[email protected]>
Reviewed-by: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Joseph Qi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>