ocfs2: o2net: set tcp user timeout to max value

ocfs2: o2net: set tcp user timeout to max value

When tcp retransmit timeout(15mins), the connection will be closed.
Pending messages may be lost during this time.  So we set tcp user timeout
to override the retransmit timeout to the max value.  This is OK for ocfs2
since we have disk heartbeat, if peer crash, the disk heartbeat will
timeout and it will be evicted, if disk heartbeat not timeout and
connection idle for a long time, then this means the cluster enters
split-brain state, since fence can't happen, we'd better keep the
connection and wait network recover.

Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>