TT#141802 Add firmware 'tags' support for 'version' firmware endpoint

Improve NGCP to return firmware using the 'Firmware tag' if not such 'Version' found:

>> curl http://myserver.com:1445/device/autoprov/firmware/0004138aa403/version/10.12.22.1
> firmware 10.12.22.1
>> curl http://myserver.com:1445/device/autoprov/firmware/0004138aa403/version/tag1
> firmware 10.12.22.1

>> curl http://myserver.com:1445/device/autoprov/firmware/0004138aa403/version/10.32.1.0
> firmware 10.32.1.0
>> curl http://myserver.com:1445/device/autoprov/firmware/0004138aa403/version/mytag
> firmware 10.32.1.0

Change-Id: Ie6a75d82887d4b9945a04e599991d8996ede00d6
(cherry picked from commit 8516d817c6)

lib/NGCP/Panel/Controller/Device.pm

@@ -1934,16 +1934,29 @@ sub dev_field_firmware_base :Chained('/') :PathPart('device/autoprov/firmware')
 
 sub dev_field_firmware_download :Chained('dev_field_firmware_base') :PathPart('version') :Args(1) {
     my ($self, $c, $ver) = @_;
+    my $tag = "";
 
     my $rs = $c->stash->{dev}->profile->config->device->autoprov_firmwares->search({
         device_id => $c->stash->{dev}->profile->config->device->id,
         version => { '=' => $ver },
     });
 
+    unless($rs->first) {
+        $tag = $ver;
+        $rs = $c->stash->{dev}->profile->config->device->autoprov_firmwares->search({
+            device_id => $c->stash->{dev}->profile->config->device->id,
+            tag => { '=' => $tag },
+        });
+    }
+
     my $fw = $rs->first;
     unless($fw) {
         $c->response->content_type('text/plain');
-        $c->response->body("404 - firmware version '$ver' not found latest");
+        if(defined $tag && length $tag > 0) {
+            $c->response->body("404 - firmware tag '$tag' is latest");
+        } else {
+            $c->response->body("404 - firmware version '$ver' is latest");
+        }
         $c->response->status(404);
         return;
     }