Linting rule for breaking lines before/after binary operator

Currently our python linter does not like if you break a line after OR before a binary operator. So you can't really perform line breaks at all in these cases. We need to choose one rule to follow. It seems that PEP8 prefers breaking before the operator to align operators, so let's go with it. To enforce the same rules on both CI and nomad dev, we should put them into a conf file.