Proxy generation does not import the class name of an Async interface declared in a different package

[vietj]

Leading to a compilation error similar to:

DiscoveryOMEPluginServiceVertxEBProxy.java:80: error: cannot f
ind symbol
        handler.handle(Future.succeededFuture(new CollectionCommonServiceVertxEBProxy(_vertx, res.result().headers().get("proxyaddr"))));
                                                  ^
  symbol:   class CollectionCommonServiceVertxEBProxy
  location: class DiscoveryOMEPluginServiceVertxEBProxy
1 error