Rename TunnelConnection to TunnelServer

The class manages the server socket, listening for new clients. Thus,
the name "TunnelServer" is more precise.

relay/src/main/java/com/genymobile/relay/Relay.java

@@ -41,7 +41,7 @@ public void start() throws IOException {
         Selector selector = Selector.open();
 
         // will register the socket on the selector
-        TunnelConnection tunnelConnection = new TunnelConnection(port, selector);
+        TunnelServer tunnelServer = new TunnelServer(port, selector);
 
         SelectorAlarm selectorAlarm = new SelectorAlarm(selector);
         selectorAlarm.start();
@@ -51,7 +51,7 @@ public void start() throws IOException {
             Set<SelectionKey> selectedKeys = selector.selectedKeys();
 
             if (selectorAlarm.accept()) {
-                tunnelConnection.cleanUp();
+                tunnelServer.cleanUp();
             } else if (selectedKeys.isEmpty()) {
                 throw new AssertionError("selector.select() returned without any event, an invalid SelectionKey was probably been registered");
             }

relay/src/main/java/com/genymobile/relay/TunnelConnection.java → relay/src/main/java/com/genymobile/relay/TunnelServer.java

@@ -13,13 +13,13 @@
 /**
  * Handle the connections from the clients.
  */
-public class TunnelConnection {
+public class TunnelServer {
 
-    private static final String TAG = TunnelConnection.class.getSimpleName();
+    private static final String TAG = TunnelServer.class.getSimpleName();
 
     private final List<Client> clients = new ArrayList<>();
 
-    public TunnelConnection(int port, Selector selector) throws IOException {
+    public TunnelServer(int port, Selector selector) throws IOException {
         ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
         serverSocketChannel.configureBlocking(false);
         // ServerSocketChannel.bind() requires API 24