added test for template overrides Signed-off-by: Brian Coca <briancoca+ansible@gmail.com>

Signed-off-by: Brian Coca <briancoca+dev@gmail.com>

test/jinja2_overrides.tpl

+#env: variable_end_string: @@, variable_start_string: @@
+
+{% raw %}
+ if this succeeds you should see '{{ ansible_hostname }}' with the hostname on the line above
+ if this fails you should see '@@ ansible_hostname @@' with the hostname on the line beneath
+{% endraw %}
+
+@@ ansible_hostname @@
+{{ ansible_hostname }}
+