web-proxy: add firewall configuration

Allow internal http and https to pass on web proxies.
To-do: logic for web proxies directly attached to the internet.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

pillar/role/web-proxy.sls

@@ -28,4 +28,9 @@ nginx:
       {%- endfor %}
     {%- endif %}
 
-
+firewalld:
+  zones:
+    internal:
+      services:
+        - http
+        - https