Make Squid Charm of Loadbalancer type

By adding this change the squid charm
will expose an external IP

Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>

magma/hackfest_squid_cnf/charms/squid/metadata.yaml

@@ -10,6 +10,9 @@ tags:
     - misc
 series:
     - kubernetes
+deployment:
+    type: stateful
+    service: loadbalancer
 storage:
     docker:
         type: filesystem
@@ -17,10 +20,4 @@ storage:
     spool:
         type: filesystem
         location: /var/spool/squid
-# -- example relations, delete if unneeded
-#requires:
-#    db:
-#        interface: mysql
-#provides:
-#    website:
-#        interface: http
+