[9] RFR 8078661: [SunPKCS11] Fails to cast into RSAPrivateCrtKey after RSA KeyPair Generation

[Valerie Peng]

Anyone has time to review a straightforward fix? The current PKCS11 code 
assume that if public exponent is available for RSA Private Key, then 
it's a RSA CRT key. However, not all vendor implementation works this 
way. Changing to a tighter check and did minor code-refactoring to avoid 
re-retrieving the attribute values.

Bug: https://bugs.openjdk.java.net/browse/JDK-8078661
Webrev: http://cr.openjdk.java.net/~valeriep/8078661/webrev.00/

Thanks,
Valerie