QmlProfiler: manage receiving trace after app stopped

Change-Id: I97409748ebac3ee8af3690f2d84d3038638a3419
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qmlprofilerclientmanager.h

@@ -59,6 +59,7 @@ public:
 
 signals:
     void connectionFailed();
+    void connectionClosed();
 
     // data
     void addRangedEvent(int,int,qint64,qint64,QStringList,QmlDebug::QmlEventLocation);