Adding a timeout to tcp dns lookup connects.

TCP isn't supported on some dns servers, which makes the old code
hang forever.

NOT adding a stopship to remove debugging stuff - it was too painful
(14s timeout on failed tcp dns lookups) so we decided not to bother people.

bug:5766949
Change-Id: I381c20c3e11b8e994438d4f7c58ef643cd36554e
1 file changed