Revert r62152 (Issue #2550). Being able to observe the results of all the buildbots...

Revert r62152 (Issue #2550).  Being able to observe the results of all the buildbots was certainly useful.  All of the platforms that have some form of BSD lineage -- FreeBSD, OS X, Solaris and Tru64 -- all pass the test.  Windows and Linux, on the other hand, don't.  Windows I knew about, Linux was a surprise.  Knowing this, I believe a more appropriate fix will revolve around test_support.bind_socket() -- this method needs to return a port that nothing in the system has bound already.  The best way to do this may just be to rely on ephemeral ports, rather than having the user specify a desired port, then fall back to four random ports, then try 0.