MT#4685 Export latest firmware version for model.

This can be used in config scripts to check whether to do an upgrade.

assets/linksys-spa5xx-configtemplate.tt

@@ -2,7 +2,7 @@
   [% barge_in = 0 -%]
   <Profile_Rule>[% config.url %]</Profile_Rule>
   <Upgrade_Enable>Yes</Upgrade_Enable>
-  <Upgrade_Rule>[% firmware.baseurl %]/$MA/from/$SWVER/next</Upgrade_Rule>
+  <Upgrade_Rule>($SWVER &lt; [% firmware.maxversion %])? [% firmware.baseurl %]/$MA/from/$SWVER/next</Upgrade_Rule>
   <Station_Name>[% phone.stationname %]</Station_Name>
   <Station_Display_Name>[% phone.stationname %]</Station_Display_Name>
   <Server_Type>RFC3265_4235</Server_Type>

lib/NGCP/Panel/Controller/Device.pm

@@ -908,11 +908,17 @@ sub dev_field_config :Chained('/') :PathPart('device/autoprov/config') :Args() {
         },
     };
 
-    $vars->{firmware} = {
-        baseurl => 'http://' . $c->req->uri->host . ':' . 
+    $vars->{firmware}->{baseurl} = 'http://' . $c->req->uri->host . ':' . 
             ($c->config->{web}->{autoprov_plain_port} // '1444') . 
-            '/device/autoprov/firmware',
-    };
+            '/device/autoprov/firmware';
+    my $latest_fw = $c->model('DB')->resultset('autoprov_firmwares')->search({
+        device_id => $model->id,
+    }, {
+        order_by => { -desc => 'version' },
+    })->first;
+    if($latest_fw) {
+        $vars->{firmware}->{maxversion} = $latest_fw->version;
+    }
 
     my @lines = ();
     foreach my $linerange($model->autoprov_device_line_ranges->all) {