Add jenkins cache env to tox file.

Change-Id: I46322bb4917d4305526a20083ce93e1e160e74b1

tests/test_worker_controller.py

@@ -105,4 +105,3 @@ class TestWorkerController(unittest.TestCase):
         response = controller.run()
         self.assertIn(c.RESPONSE_FIELD, response)
         self.assertEquals(response[c.RESPONSE_FIELD], c.RESPONSE_FAILURE)
-

tox.ini

@@ -6,10 +6,13 @@ deps = -r{toxinidir}/tools/pip-requires
        -r{toxinidir}/tools/test-requires
 commands = py.test {posargs}
 
+[tox:jenkins]
+downloadcache = ~/cache/pip
+
 [testenv:py27]
 
 [testenv:pep8]
-commands = py.test --pep8 -k pep8 --clearcache libra
+commands = pep8 --repeat --show-source --exclude=.venv,.tox,dist,doc,*openstack/common*,*lib/python*,*egg libra setup.py
 
 [testenv:pyflakes]
 deps = pyflakes