Fix tests - Add bindep.txt tec

Our tests need to compile some packages, add binary dependencies.
The list is the same as used for openstack-zuul-jobs.

Add tests files to pass the syntax checks.

Adjust test invocation to pass fake values to variables.

Change-Id: I7368990628086a03501c432b86ace48fb7a50ba5

bindep.txt

@@ -0,0 +1,16 @@
+# This is a cross-platform list tracking distribution packages needed by tests;
+# see http://docs.openstack.org/infra/bindep/ for additional information.
+
+libffi-devel [test platform:rpm]
+libffi-dev [test platform:dpkg]
+libssl-dev [platform:dpkg]
+openssl-devel [platform:rpm]
+python3-dev [compile test platform:dpkg platform:apk]
+python3-devel [compile test platform:rpm]
+libre2-dev [compile test platform:dpkg]
+libre2-4 [platform:ubuntu-bionic]
+libre2-3 [platform:debian-stretch]
+libre2-1v5 [platform:ubuntu-xenial]
+re2-devel [compile test platform:rpm]
+re2-dev [platform:apk]
+re2 [platform:rpm platform:apk]

tests/inventory

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

tests/vars.yaml

@@ -0,0 +1,2 @@
+site_logs:
+  fqdn: fake

tox.ini

@@ -37,7 +37,8 @@ commands =
     xargs -t -n1 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:venv]
 commands = {posargs}