flake8 fixes for fuelweb_test

Added flake8 check to run_test.sh for CI checks
flake8 check ignores temporary files created when
running fuelweb_test.
Change-Id: I4bf99b63b1c690c0d86f0a20bc86fe9ecd9ccfb2
Closes-Bug: #1261547
Merge "flake8 fixes for fuelweb_test"