AutoTest: Shuffle namespaces for clearer separation

Change-Id: I6ac440c6d72c3d0dbcd75907f8a6ae756f3cf5ee
Reviewed-by: hjk <hjk@qt.io>

src/plugins/autotest/autotestunittests.h

@@ -30,10 +30,11 @@
 namespace CppTools { namespace Tests { class TemporaryCopiedDir; } }
 
 namespace Autotest {
-namespace Internal {
 
 class TestTreeModel;
 
+namespace Internal {
+
 class AutoTestUnitTests : public QObject
 {
     Q_OBJECT