[MERGE][#307327] Remove broken debugging cruft, and some unused imports.

[Andrew Bennetts]

Aaron's recent CachingParentsProvider patch moved some debugging mutters from
remote.py to graph.py, but didn't test them.  As a result -Dhpss now fails with
a “NameError: global name 'mutter' is not defined” error.  It'd be easy enough
to fix the calls to use trace.mutter rather than mutter, and write tests to
ensure they work, but it's even easier to just delete them.  So here's a patch
that does that.

I don't think anyone actually uses those debug messages.  Let me know if I'm
wrong :)

-Andrew.

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