Switch TCP socket sources to nonblocking mode.

This follows a suggestion from Christian Eddie Dost <ecd@brainaid.de>,
who had this to say:

  However, gpsd hangs when used with a tcp:// device, if you start the
  device without waiting for clients (-n option), there will never be a
  client connection accepted. If you start gpsd without -n option one
  client will be accepted and receive data, but when closing the client
  connection there will be no new connection possible.

  The problem is gpsd hangs inside consume_packets() or more exactly
  inside a blocking read() on the tcp socket a few functions further
  down. consume_packets() never returns to the main select() loop.

  The following patch configures sockets to non blocking, this fixes the
  problem and gpsd works fine for me with tcp:// devices. Using this
  patch should allow the special udp handling at the end of the function
  consume_packets() to be removed.

I applied the suggested patch and also removed the special UDP
handing.  All regressions test pass (including the UDP one), and gpsd
-N tcp://data.aishub.net:4006 reads AIS data as expected.

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