Fix archive Rest API - RESTEASY004687: Please close clients yourself.

[rsoika]

The ArchiveRemoteService method loadFileFromArchive produces messages like this:

11:42:40,475 WARN [org.jboss.resteasy.client.jaxrs.i18n] (Finalizer) RESTEASY004687: Closing a class org.jboss.resteasy.client.jaxrs.engines.ApacheHttpClient43Engine instance for you. Please close clients yourself.

We should close the client in this method:

...
    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(url);
    Response response = target.request().post(Entity.entity(user, mediaType));

    try {
        if (response.getStatus() != 200) {
            throw new RuntimeException("Failed with HTTP error code : " + response.getStatus());
        }
        System.out.println("Successfully got result: " + response.readEntity(String.class));
    } finally {
        response.close();
        client.close();
    }