[INTERNAL][FIX] QUnit 1.x: support predefined QUnit.config

Without this fix, QUnit 1.x starts its queue immediately when it is
loaded after DOMContentloaded. Test providers have no chance to
configure autostart:false in that case.

The fix is a downport of QUnit's own fix for
qunitjs/qunit#1059 .

Change-Id: If806792ddb21a79eeb71b59ab33dc443aa29934c

src/sap.ui.core/src/sap/ui/thirdparty/qunit.js

@@ -153,6 +153,17 @@ config = {
 	callbacks: {}
 };
 
+//### BEGIN MODIFIED BY SAP
+// downport of fix for https://github.com/qunitjs/qunit/issues/1059
+// take a predefined QUnit.config and extend the defaults
+var globalConfig = window && window.QUnit && window.QUnit.config;
+
+// only extend the global config if there is no QUnit overload
+if (window && window.QUnit && !window.QUnit.version) {
+	extend(config, globalConfig);
+}
+//### END MODIFIED BY SAP
+
 // Push a loose unnamed module to the modules collection
 config.modules.push( config.currentModule );