RFR 8144107: jdk/security tests not included

[Wang Weijun]

Please review the fix at

   http://cr.openjdk.java.net/~weijun/8144107/webrev.00/

The recent JarSigner API changeset includes some tests in jdk/security but the directory is not included in any test group. This fix adds it into jdk_security3.

Thanks
Max