tests/sitecustomize.py

merge: remove obsolete check for untracked files in 'dm' action

Since 0776a6cababe (merge: don't use unknown(), 2012-02-09), untracked
files are no longer included in the manifest diff, so there is no need
to check exclude them when renaming files for directory moves with the
'dm' action.

try:
    import coverage
    getattr(coverage, 'process_startup', lambda: None)()
except ImportError:
    pass