Add tox 'specs' test to pep8 environment

It turns out the gate doesn't actually use tox for the docs test,
so in order to catch errors in specs, this commit moves the tox
specs testing to the pep8 environment, where the gate actually does
use tox for the test.

Change-Id: I660d360eed5b109c85d7ba73d421d3973c96c452

tox.ini

@@ -42,12 +42,13 @@ commands = flake8
            CONSTITUTION.rst HACKING.rst README.rst
 	   # Run security linter
            bandit -r octavia -ll -ii -x octavia/tests
+       # Make sure specs follow our template
+           find . -type f -name "*.pyc" -delete
+           python -m unittest specs-tests.test_titles
 
 [testenv:docs]
 commands =
     python setup.py build_sphinx
-    find . -type f -name "*.pyc" -delete
-    python -m unittest specs-tests.test_titles
 
 [testenv:venv]
 commands = {posargs}