Added Integration test for testing redirect to absolute URL, fixed nginx controller SERVICE_UP issue

Added the following to Hello.java (in hello-world.war):
```
        String requestUrl = new String(request.getRequestURL());
        if (requestUrl.endsWith("/hello/redirect")) {
            response.setStatus(307);
            response.addHeader("Location", "/hello");
            return;
        }
        if (requestUrl.endsWith("/hello/redirectAbsolute")) {
            response.setStatus(307);
            response.addHeader("Location", "http://" + request.getServerName() + ":" + request.getLocalPort() + "/hello");
            return;
        }
```