grafana: Bind only to localhost

Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/grafana/templates/grafana.ini.j2

@@ -30,7 +30,7 @@
 ;protocol = http
 
 # The ip address to bind to, empty will bind to all interfaces
-;http_addr =
+http_addr = 127.0.0.1
 
 # The http port  to use
 ;http_port = 3000