[MERGE] Add and use _get_protocol_factory_for_bytes function (protocol v3 patch 3/7)

[Andrew Bennetts]

This is the third in a series of patches that implement version 3 of the smart
server protocol.  The full branch with all changes combined is at
<http://people.ubuntu.com/~andrew/bzr/protocol-v3-loom/>

medium.py 
---------

The changes in this file implement a '_get_protocol_factory_for_bytes' function
that figures out the right protocol factory (i.e. what version of the protocol
is being used, and thus which decoder to use) for some given bytes.

I also renamed excess_bytes to unused_data to be consistent with the same change
made in protocol.py

wsgi.py
-------

Use _get_protocol_factory_for_bytes, rather than duplicating the protocol
version detection.

http_utils.py
-------------

Use _get_protocol_factory_for_bytes, rather than hard-coding the test server to v1!

-Andrew.

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