This patch also adds checks for executable files in
pep8 job.
nose ignores executable files by default, so it is important
to ensure executable flag is not set for test files [1].
openstack_dashboard/test/test_plugins/panel_tests.py was not
tested actually and it was broken. This commit fixes it too.
[1] http://nose.readthedocs.io/en/latest/usage.html#cmdoption-exe
Co-Authored-By: Ivan Kolodyazhny <e0ne@e0ne.info>
Change-Id: I3a124fa2f9f0676b2b43a094e32e3d8b18fa6005
6c45c47e4b