Merge remote-tracking branch 'lamby/misc-fixes-796786' into merge

* lamby/misc-fixes-796786:
  daklib/utils.py: mandantory -> mandatory spelling error
  daliblib/dak_exceptions: Add trailing comma to avoid future VCS noise
  tests/test_packagelist.py: make executable
  dalkib/dbconn.py: Mention which version is installed in sqlalchemy check
  dak/copy_installer.py: Include which directory doesn't exist in exception