Python coding style for DAST

In gitlab-org/security-products/dast!14 (merged) we decided to use pep8 for the python code https://www.python.org/dev/peps/pep-0008/

Make all python code in https://gitlab.com/gitlab-org/security-products/dast conformant with pep8
Enforce in DAST's pipeline that new commits are conformant with pep8

Edited Jun 11, 2019 by Dennis Appelt