test(discovery-v1): update service url in IT tests

Author: kevinkowa

discovery/src/test/java/com/ibm/watson/discovery/v1/DiscoveryServiceIT.java

@@ -143,7 +143,7 @@ public static void cleanupClass() throws Exception {
   public void setup() throws Exception {
     super.setUp();
     String apiKey = getProperty("discovery.apikey");
-    String url = getProperty("discovery.url");
+    String url = "https://api.us-south.discovery.watson.cloud.ibm.com";
     Authenticator authenticator = new IamAuthenticator(apiKey);
     discovery = new Discovery("2019-04-30", authenticator);
     discovery.setServiceUrl(url);