RFR 8215769: Java cannot probe pkcs12 files exported by Firefox

[Weijun Wang]

Please take a review at

   https://cr.openjdk.java.net/~weijun/8215769/webrev.00/

It's currently P4 because I don't think many people import pkcs12 files from Firefox to Java, and even if so, one can always specify the storepass as a workaround. If you think this is more useful I can change it to P3 and push to JDK 12. This fix is safe.

Thanks
Max