mark all unsafe launch-time extra vars as !unsafe

see: https://github.com/ansible/tower/issues/1338
see: https://bugzilla.redhat.com/show_bug.cgi?id=1565865

awx/main/conf.py

@@ -132,6 +132,15 @@ register(
     required=False,
 )
 
+register(
+    'ALLOW_JINJA_IN_JOB_TEMPLATE_EXTRA_VARS',
+    field_class=fields.BooleanField,
+    label=_('Allow Jinja template execution in Job Template extra vars'),
+    help_text=_('Ansible allows variable substitution and templating via the Jinja2 templating language for a variety of arguments (such as --extra-vars); enabling this flag allows arbitrary Jinja templates to be used on extra vars defined in Job Templates.'),  # noqa
+    category=_('Jobs'),
+    category_slug='jobs',
+)
+
 register(
     'AWX_PROOT_ENABLED',
     field_class=fields.BooleanField,