Logging to stdout and bzr selftest

[Brian M. Carlson]

When running "bzr selftest", the code prints lots of unnecessary junk to
the screen.  A patch against r1189 is attached to use the logging
mechanism instead.  It causes no regressions.

BTW, sorry about the modeline, but vim is not currently set up to do
PEP-8 compliant code, and that's the only way that it will.
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