CLN: PEP8 cleanup of rpy/tests
Fixes pep8 errors in test_common.py in rpy/tests.

Ran autopep8, then fixed remaining errors manually. Test still passes locally.

Should this issue be closed? Can revisit another time, if desired.
 yeh....pep8 are a complicated issue.....generally we will just do late in the release when noone else is touching code....so closing for now....but can revist later
