SCMClient unit tests recently got a refresh, fixing up a lot of

comparisons to better catch changes in diff content or dictionary

results.
The Bazaar unit tests were included in this, but still had old md5-based

comparison of diff contents, with some hacky ways of building up a

response and validating it. This wasn't very maintainable, though it was

easier to leave it be while fixing everything else up.
This change replaces those with mostly-direct result comparisons. The

diffs are passed through a normalization process, using the exact same

logic introduced for the Perforce diff comparisons. This ensures that

dates are always a fixed value.

Unit tests pass on Python 3.7-3.11.