Switch to flake8

[magland]

@luiztauffer I'm switching from autopep8 to flake8 (thanks for the tip).

I made it required for passing the tests, but I'm ignoring a lot of the rules.

[codecov]

Codecov Report

Attention: 66 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
...protocaas/api_helpers/clients/_get_mongo_client.py	0.00% <ø> (ø)
.../protocaas/api_helpers/clients/_remove_id_field.py	0.00% <ø> (ø)
python/protocaas/api_helpers/clients/pubsub.py	0.00% <ø> (ø)
...on/protocaas/api_helpers/core/_create_random_id.py	0.00% <ø> (ø)
...on/protocaas/api_helpers/core/_get_project_role.py	0.00% <ø> (ø)
...aas/api_helpers/core/_hide_secret_params_in_job.py	0.00% <ø> (ø)
python/protocaas/api_helpers/core/settings.py	0.00% <ø> (ø)
...hon/protocaas/api_helpers/routers/client/router.py	0.00% <ø> (ø)
...aas/api_helpers/routers/compute_resource/router.py	0.00% <ø> (ø)
...i_helpers/routers/gui/_authenticate_gui_request.py	0.00% <ø> (ø)
... and 29 more

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