[8] code review 8013170: Spec for PBEParameterSpec does not specify behavior when paramSpec is null

[Vincent Ryan]

Please review the following clarification to the spec for 
javax.crypto.spec.PBEParameterSpec
to specify that its new 3-arg constructor can also accept null as its final 
argument:

http://cr.openjdk.java.net/~vinnie/8013170/webrev.00/

Thanks.