[15] RFR 8172680: Support SHA-3 based Hmac algorithms

[Valerie Peng]

Anyone has time to help review this straight forward RFE? It's to add 
SHA-3 support to Hmac.

RFE: https://bugs.openjdk.java.net/browse/JDK-8172680

Webrev: http://cr.openjdk.java.net/~valeriep/8172680/webrev.00/

Mach5 run is clean.

Thanks,
Valerie