Switch from tox-linters to tox-pep8

Change-Id: Ibb695f443622aa7814eac3c1148b040b5f0ef8e5
diff --git a/.zuul.yaml b/.zuul.yaml
index e8b070f..8095733 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -4,6 +4,6 @@
       jobs:
         - tox-docs
         - tox-cover
-        - tox-linters
+        - tox-pep8
         - tox-py35
         - tox-tarball