Fix parsing binary diffs in CVS.
Review Request #8540 — Created Nov. 15, 2016 and submitted
Recent releases made changes to CVS diff parsing, which caused a crash when parsing binary diffs. Before, binary diffs weren't really handled specially (they weren't marked as binary diffs), but they at least didn't crash. This change implements proper parsing of binary diffs. It now looks for the binary indicator and sets the appropriate flag, and computes the correct filenames for the original and modified files.
Unit tests pass.
Tool: PEP8 Style Checker Processed Files: reviewboard/scmtools/cvs.py reviewboard/scmtools/tests/test_cvs.py Tool: Pyflakes Processed Files: reviewboard/scmtools/cvs.py reviewboard/scmtools/tests/test_cvs.py