AutoTest: Add automatic run after build

Add an option to automatically run tests if the build
succeeded and the current project has tests.

Change-Id: I1fe028be84279b9b488f78590565c6d4b0449e34
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/autotest/testsettings.h

@@ -52,6 +52,7 @@ struct TestSettings
     bool popupOnStart = true;
     bool popupOnFinish = true;
     bool popupOnFail = false;
+    bool runAfterBuild = false;
     QHash<Core::Id, bool> frameworks;
     QHash<Core::Id, bool> frameworksGrouping;
 };