how to get any available port

[jepler at unpythonic.net]

Apparently, calling bind() with a zero "port" will choose some available port
number, as demonstrated by this program:

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("", 0))
print s.getsockname()

Here's how it behaved over several runs:
$ python soc.py 
('0.0.0.0', 34205)
$ python soc.py 
('0.0.0.0', 34206)
$ python soc.py 
('0.0.0.0', 34207)

I don't know for sure whether this is standard behavior for sockets, or whether
it's a special behavior of linux.

Jeff
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