Move bash8 to run under pep8 tox env

To make sure we catch bash8 violations, run under the check and
gate pep8 checks. We do not run a distinct bash8 job for Keystone.

Change-Id: I07ddf419483ad4ab73d9f34568fca0df3d9ca248

tox.ini

@@ -33,6 +33,9 @@ commands =
 envdir = {toxworkdir}/venv
 commands = 
   flake8 {posargs}
+  # Run bash8 during pep8 runs to ensure violations are caught by
+  # the check and gate queues
+  bash8 examples/pki/gen_pki.sh tools/debug_helper.sh
   # Check that .po and .pot files are valid.
   # NOTE(jaegerandi): We search for files ending with '.po' or '.pot'.
   # The regex '.*\.pot?' does not work on OS X and we assume there are no
@@ -40,11 +43,6 @@ commands =
   bash -c "find keystone -type f -regex '.*\.pot*' -print0| \
            xargs -0 -n 1 msgfmt --check-format -o /dev/null"
 
-[testenv:bash8]
-envdir = {toxworkdir}/venv
-commands =
-  bash8 examples/pki/gen_pki.sh tools/debug_helper.sh
-
 [tox:jenkins]
 downloadcache = ~/cache/pip