A recent change in pep/pycodingchecks introduced new warnings as part of
the pep8 target that causes pep8 to fail now.
This patch fixes code that issued warnings W503,E731,E266,E402
In addition, old tests which were not ran anyway, and are no longer relevant (test_firewall)
were deleted.
Change-Id: Ic784775535547160a0dc0af5d5debfbb1833c6ba