Include ansible-playbook syntax-check for tox pep8

Syntax check our playbooks / roles when we run pep8. This way we can
quickly tests if our playbooks are valid.

Change-Id: Id9b44216820a2b0702e1cfa46cd7603c89ed40d3
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

tests/inventory

@@ -0,0 +1,2 @@
+[all]
+localhost

tox.ini

@@ -31,6 +31,9 @@ commands =
   #   ANSIBlE0012: Commands should not change things if nothing needs doing
   bash -c "cd playbooks; find . -type f -regex '.*.y[a]?ml' -print0 | xargs -t -n1 -0 \
     ansible-lint -x ANSIBLE0012"
+  # Ansible Syntax Check
+  bash -c "find playbooks -type f -regex '.*.y[a]?ml' -print | xargs -t -n1 \
+    ansible-playbook --syntax-check -i tests/inventory > /dev/null"
 
 [testenv:venv]
 commands = {posargs}