Increase individual test timeout from 10 min to 20 min

Each test's timeout limit is multiplied by the time factor value. One
base time limit is 10 minutes, increase it to 20 minutes.

Signed-off-by: Jason Feng <fengj@ca.ibm.com>

openjdk.test.jck/src/test.jck/net/adoptopenjdk/stf/Jck.java

@@ -571,7 +571,7 @@ public void jckConfigurationForMultijvmWithNoAgent(StfCoreExtension test) throws
 				throw new StfException("Unknown platform:: " + platform);
 			}
 			fileContent += "concurrency " + concurrencyString + ";\n";
-			fileContent += "timeoutfactor 1" + ";\n";				// java_awt and javax_management require more than 1h to finish tests
+			fileContent += "timeoutfactor 2" + ";\n";	// 2 base time limit equal 20 minutes
 			fileContent += keyword + ";\n";
 
 			if (platform.equals("win32")) {