MT#13903 Add package_id to voucher API.

Change-Id: I02ac5593d7f2e5055c46d93ec1f8492c0d80bc94

lib/NGCP/Panel/Form/Voucher/ResellerAPI.pm

@@ -52,6 +52,15 @@ has_field 'customer' => (
     },
 );
 
+has_field 'package_id' => (
+    type => 'PosInteger',
+    required => 1,
+    element_attr => {
+        rel => ['tooltip'],
+        title => ['The package this voucher belongs to.']
+    },
+);
+
 sub validate_valid_until {
     my ($self, $field) = @_;