TT#2399 Add grafana service config

This moves the hard-coded configuration from the code into a proper
section in the config file.

Change-Id: I895fe27e404e7bdbf6127ff86c661e9d72d419a2

lib/NGCP/Panel/Controller/Grafana.pm

@@ -20,7 +20,9 @@ sub root :Chained('/') :PathPart('grafana') :CaptureArgs() {
 
     my $path = join '/', @fullpath;
     $path .= '?' . $c->req->uri->query if $c->req->uri->query;
-    my $url = "http://127.0.0.1:3000";
+    my $url = $c->config->{grafana}{schema} . '://' .
+              $c->config->{grafana}{host} . ':' .
+              $c->config->{grafana}{port};
     $url .= "/".$path if length $path;
     $c->log->debug("accessing grafana via ngcp-panel proxy, url is $url");
 

ngcp_panel.conf

@@ -63,6 +63,12 @@ log4perl.appender.Default.layout.ConversionPattern=%d{ISO8601} [%p] [%F +%L] %m{
     subscriber    SubscriberRegisterOverview
 </dashboard>
 
+<grafana>
+  schema http
+  host localhost
+  port 4000
+</grafana>
+
 <faxserver>
   sendfax	/usr/bin/sendfax
   ip		127.0.0.1