Made discovery more reliable & added docs/tests

- Added unit tests
- Added documentation for discovery classes
- Improved error handling

Tags: #story[1281]

src/main/java/seng302/gameServer/ServerAdvertiser.java

@@ -1,10 +1,7 @@
 package seng302.gameServer;
 
-import com.sun.org.apache.xpath.internal.operations.Bool;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import seng302.serverRepository.ServerListing;
-import seng302.serverRepository.ServerRepositoryClient;
+import seng302.discoveryServer.util.ServerListing;
+import seng302.discoveryServer.DiscoveryServerClient;
 
 import javax.jmdns.JmDNS;
 import javax.jmdns.ServiceInfo;
@@ -38,14 +35,14 @@ public class ServerAdvertiser {
     private static ServerAdvertiser instance = null;
     private static JmDNS jmdnsInstance = null;
     private ServiceInfo serviceInfo; // Note: Whenever this is changed, our service will be re-registered on the network.
-    private ServerRepositoryClient repositoryClient;
+    private DiscoveryServerClient repositoryClient;
 
     private Hashtable<String ,String> props;
 
     private ServerAdvertiser() throws IOException{
         jmdnsInstance = JmDNS.create(InetAddress.getByName(getLocalHostIp()));
 
-        repositoryClient = new ServerRepositoryClient();
+        repositoryClient = new DiscoveryServerClient();
 
         props = new Hashtable<>();
         props.put("map", "");

src/main/java/seng302/gameServer/messages/ServerRegistrationMessage.java

@@ -1,6 +1,6 @@
 package seng302.gameServer.messages;
 
-import seng302.serverRepository.ServerListing;
+import seng302.discoveryServer.util.ServerListing;
 
 public class ServerRegistrationMessage extends Message {
     private int size;