Fix TinyManagementTest to support test coverage measurements

Cobertura adds methods to every class it's analyzing. In the
testRest() method of the TinyManagementTest class, every method of
the TinyManagement instance will be called via reflection without
regarding the method signature, eg. parameters count.
Add mandatory JAR manifest entries for Webstart deployments

For more information see http://docs.oracle.com/javase/tutorial/deployment/jar/secman.html
Fix TinyManagementTest to support test coverage measurement

The commit 96098a78d9ecfa612e9ffbb7bf05e5706783732d doesn't fix all
problems.