Debugger: Simplify handling of requestRemoteSetup in QmlCppEngine

Just emit the requestRemoteSetup on your own in QmlCppEngine. Also
properly check the related state transitions in DebuggerEngine.

Change-Id: I15dc4236303911126de7eee63ed996bdd8e5c5a8
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -5018,11 +5018,13 @@ void GdbEngine::resetCommandQueue()
 
 void GdbEngine::handleRemoteSetupDone(int gdbServerPort, int qmlPort)
 {
+    notifyEngineRemoteSetupDone();
     m_gdbAdapter->handleRemoteSetupDone(gdbServerPort, qmlPort);
 }
 
 void GdbEngine::handleRemoteSetupFailed(const QString &message)
 {
+    notifyEngineRemoteSetupFailed();
     m_gdbAdapter->handleRemoteSetupFailed(message);
 }