ocfs2/dlm: Use negotiated o2dlm protocol version

ocfs2/dlm: Use negotiated o2dlm protocol version

Patch fixes a bug in the o2dlm protocol negotiation in that it is using
the builtin version rather than the negotiated version during the domain
join. This causes join errors when a node having kernel >= 2.6.37 joins
a cluster with nodes having kernels < 2.6.37.

This only affects the o2cb cluster stack.

Signed-off-by: Sunil Mushran <[email protected]>
Reported-by: Jacek Stepniewski <[email protected]>
Acked-by: Mark Fasheh <[email protected]>
Signed-off-by: Joel Becker <[email protected]>