ansible-lint: Add tests/inventory and vars.yaml

add fake data for ansible syntax as invoced by tox.ini.

Co-Authored-By: Jesse Keating <omgjlk@us.ibm.com>
Change-Id: Iad8654c53ec6c68db72c40eddda3d79c8f4561dc

tests/inventory

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

tests/vars.yaml

@@ -0,0 +1,6 @@
+site_logs:
+  fqdn: fake
+site_zuulv3_dev:
+  fqdn: fake
+fileserver:
+  fqdn: fake

tox.ini

@@ -38,7 +38,8 @@ commands =
     xargs -t -n1 -0 ansible-lint -xANSIBLE0012"
   # Ansible Syntax Check
   bash -c "find playbooks -type f -regex '.*.ya?ml' -exec \
-    ansible-playbook --syntax-check -i {toxinidir}/tests/inventory \{\} + > /dev/null"
+    ansible-playbook --syntax-check -i {toxinidir}/tests/inventory \
+    -e @tests/vars.yaml \{\} + > /dev/null"
 
 [testenv:gerrit]
 deps = PyYAML