[MERGE] Try harder to avoid loading plugins during the test suite.

[Andrew Bennetts]

This is a bit of a band-aid.  I think maybe a deeper fix would be better.
But in the meantime, here's a patch that fixes a few parts of the test suite
that would inadvertently load plugins while running the test suite.  If you
do “bzr --no-plugins selftest” it's rather surprising to get tracebacks with
things like bzrlib/plugins/svn in them!

-Andrew.

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