Gate on certain pyflakes failures

To prevent recent gating problems from typos, an
import not used and redefinition of function problems in
the source code have become gating.

Fixes: Bug #1131275
Change-Id: I7011f3ac5940afc70c38758e67a2222a66e625c3
Signed-off-by: Steven Dake <sdake@redhat.com>