RFR JDK-8164639: Configure PKCS11 tests to use user-supplied NSS libraries

[sha.jiang at oracle.com]

Hi,
This patch provides a system property, exactly test.nss.lib.path, for 
specifying the absolute path to the custom NSS lib.
And it also removes the NSS 3.16 binary libs on windows and macosx from 
repo.
On these two platforms, PKCS11 tests will download new built NSS 3.35 
libs from Artifactory.

Webrev: http://cr.openjdk.java.net/~jjiang/8164639/webrev.00/
Issue: https://bugs.openjdk.java.net/browse/JDK-8164639

Best regards,
John Jiang