[qa] Add run-qa-checks, upgrade to openwisp-utils 0.5.1, black formatter

[nemesifier]

Add run-qa-checks, upgrade to openwisp-utils 0.5.1 and reformat code with black.

[morrme]

I'd like to help with this. I am new to your project.

[NoumbissiValere]

welcome to OpenWISP @morrme . Sure, you can work on it. if you haven't yet seen our docs, you read more about the project from http://openwisp.io/docs/

[nemesifier]

Go for it @morrme, see how it's done in another module to replicate it here, eg:

• https://github.com/openwisp/django-netjsonconfig/blob/master/run-qa-checks & https://github.com/openwisp/django-netjsonconfig/blob/master/.travis.yml#L28

[morrme]

Thank you. I am not familiar with your run-qa-checks. Are you seeking to add the functionality here
https://github.com/openwisp/openwisp-utils/blob/master/run-qa-checks
to your project?

Edit: Thanks @nemesisdesign !