RFR 8076190: Support passwordless access to PKCS12 keystores

[Weijun Wang]

Please review the code change and CSR at

   webrev: http://cr.openjdk.java.net/~weijun/8076190/webrev.01/
   CSR: https://bugs.openjdk.java.net/browse/JDK-8202590

The bug is at

   https://bugs.openjdk.java.net/browse/JDK-8076190

This is the 1st part of the process to make cacerts using pkcs12:

1. Support passwordless access to PKCS12 keystores
2. Update default algorithms and params when creating a PKCS12 keystore
3. Update keytool to support passwordless pkcs12 keystores
4. Migrate cacerts to pkcs12

Thanks
Max