Do not error when running pep8 with py3
Do not error when running pep8 with py3

Ignore pep8 errors on python2 specific lines that fail in python 3 pep8.

Change-Id: I3895e09ea9e68eb318da92297743f5090b50c3f5

klmitch/pbr,openstack-dev/pbr,openstack-dev/pbr,openstack-dev/pbr,klmitch/pbr