[9] RFR: 8047223: Add algorithm parameter to EncodedKeySpec class and its two subclasses

[Jason Uh]

Please review this change, which adds a constructor taking an algorithm 
name parameter to EncodedKeySpec and its subclasses. This allows the 
algorithm name to be retrieved in subsequent calls to the EncodedKeySpec.

webrev: http://cr.openjdk.java.net/~juh/8047223/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8047223
Thanks,
Jason