[patch 3/3] re-using and garbage collection of python BusName objects

[Robert McQueen]

This sets up a WeakValueDictionary per-connection to cache instances of
BusName objects, overrides creation (__new__) to pull instances from the
cache, and uses release_name from __del__ to remove the low-level name
when they go out of scope.

Also attached is a test program which shows this and the lower-level
code behaving correctly.

Regards,
Rob
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