[9] request for review: 8059627: Enable PKCS11 tests on Mac

[Vincent Ryan]

Please review this enhancement to support running the PKCS11 testsuite on Mac.
The NSS libraries for Mac OSX are included with the testsuite as they might not be present on the platform.
(This is similar to the way NSS libraries for Windows are also included.)

Bug: https://bugs.openjdk.java.net/browse/JDK-8059627
Webrev: http://cr.openjdk.java.net/~vinnie/8059627/webrev.00/

Thanks.