Fix python check

[lucasmlp]

Relates to #303

[dceara]

Hi @lucasmlp,

Thanks for the PR. However, we cannot accept it in its current form, it's missing DCO (developer's certificate of origin, i.e., Signed-off-by: ..).

Also, in general, OVN usually expects contributions in the form of patches on the ovs-dev mailing list. We do look at PRs on GitHub occasionally, so not as consistently as we check for patches on the mailing list.

A full description on how to contribute to OVN is here:
https://docs.ovn.org/en/latest/internals/contributing/

For posting patches to the mailing list, this section is the most relevant:
https://docs.ovn.org/en/latest/internals/contributing/submitting-patches.html

If for some reason you have issues sending the fix as a patch email to the dev list please let me know and I can try to assist. In particular for this PR I'd recommend at least updating the commit log with DCO (Signed-off-by: ...) and running checkpatch.py, e.g., on your branch ./utilities/checkpatch.py -1.

Regards,
Dumitru