Fix overly permissive file permissions in luigi/lock.py #3308
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Fixes #3303
Update file permissions in
luigi/lock.py
to be more restrictive.pid_dir
directory from0o777
to0o700
in theacquire_for
function.test_acquiring_partially_taken_lock
andtest_acquiring_lock_from_missing_process
intest/lock_test.py
to check for the new file permissions0o700
.