[16] RFR JDK-8246383: NullPointerException in JceSecurity.getVerificationResult when using Entrust provider

[Valerie Peng]

Anyone has cycles to review this somewhat trivial changes? JceSecurity 
has this shared SecureRandom instance which may lead to NPE when certain 
3rd party JCE provider is set as most preferred. Removing this shared 
instance and change to create default SecureRandom obj when needed.

Bug: https://bugs.openjdk.java.net/browse/JDK-8246383

Webrev: http://cr.openjdk.java.net/~valeriep/8246383/webrev.00/

Thanks,
Valerie