Remove cyclic import from ignored for tests.
Reducing repeated pylint configs by defining test configs as a delta.

Uses ConfigParser to append modifications onto base file and
writes a new config file (which is gitignore-ed) before running
pylint.
Putting pylint additions for tests into run_pylint.
Merge pull request #302 from dhermes/remove-cyclic-twice

Remove cyclic import from ignored for tests.