Fix clearcase diff tests.

Review Request #12603 — Created Sept. 14, 2022 and submitted — Latest diff uploaded

Information

RBTools
release-3.x

Reviewers

The diff tests had an incorrect return type for the directory diffing
command invocations (returning a single bytestring rather than a list of
bytes as expected by split_lines=True. This happened to work correctly
because of the particular nature of the diff results, but wasn't
following the right code paths afterword. Fixing the return value
therefore required updating subsequent calls in the expect order.

Ran unit tests.

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