AutoTest: Limit search for test tree items to respective root

If searching for a test tree item matching a QtTestResult
we can safely limit searching to the subtree holding
QtTests or QuickTests.
Additionally store information whether it is a Quick or
pure Qt test into the result to limit it to a single root.

Change-Id: I240e778448d99434d188d90a110dfa4f1934c950
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/quick/quicktestframework.h

@@ -28,6 +28,14 @@
 #include "../itestframework.h"
 
 namespace Autotest {
+namespace QuickTest {
+namespace Constants {
+
+const char FRAMEWORK_NAME[]              = "QtQuickTest";
+
+} // namespace Constants
+} // namespace QuickTest
+
 namespace Internal {
 
 class QuickTestFramework : public ITestFramework