This allows the `kas build` command to be used when you need to pass
extra arguments to bitbake.
A `--` separator is needed when passing arguments which begin with a
dash so that argparse doesn't try to parse them as kas further
arguments.
For example, to pass `--skip-setscene` to bitbake:
kas build config.yml -- --skip-setscene
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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