Add unit tests for CVS diffs.

Review Request #12571 — Created Aug. 24, 2022 and submitted — Latest diff uploaded

chipx86
RBTools
release-4.x
12572, 12570
rbtools

The CVS implementation lacked any unit tests around diffs. This change
adds some tests, testing basic diff functionality, include_files=, and
exclude_patterns=.

Some of the diff logic was reordered to help be more readable, but no
actual behavior has changed.

Note that CVS has its own cvs diff, tool, so we don't directly depend
on GNU diff.

The data for the CVS repository in testdata will be committed in a
separate change.

Unit tests pass on Python 3.7-3.11.

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