RFR (JAXP) 8161454: Fails to Load external Java method from inside of a XSL stylesheet if SecurityManager is present

[Joe Wang]

Hi,

Please review a fix to the XSLTFunctionsTest. After enabling 
SecurityManager, the test now needs to set the extension ClassLoader for 
the extension class.

JBS: https://bugs.openjdk.java.net/browse/JDK-8161454
webrev: http://cr.openjdk.java.net/~joehw/jdk9/8161454/webrev/

Thanks,
Joe