[9] RFR 8157579: com/sun/crypto/provider/Mac/MacClone.java failed on solaris12(sparcv9 and x86)

[Valerie Peng]

Anyone has time to review this fix? The code change is in only one file 
and straightforward if you agree with the approach.
Starting S11.3 and S12, OracleUcrypto provider switched to new Ucrypto 
APIs for message digest operations and there is no clone support.
This affects the MAC impls of SunJCE provider which delegates the digest 
operation to the most preferred provider.
To ensure the clone support, I will switch to getting the digest impl 
from SUN provider if the most preferred one does not.
In the case of SUN provider is not available, it will then goes through 
provider list.

Bug: https://bugs.openjdk.java.net/browse/JDK-8157579
Webrev: http://cr.openjdk.java.net/~valeriep/8157579/webrev.00/

No new test as it's covered by existing regression test.

Thanks,
Valerie