RFR 8241960: The SHA3 message digests are not thread safe when cloned

[Alexey Bakhtin]

Hi All,

Please review fix for SHA3 message digests thread safety.
Issue reproduced on the JDK11, JDK13 and JDK14
JTREG test is provided in the patch

JBS: https://bugs.openjdk.java.net/browse/JDK-8241960
Webrev: https://cr.openjdk.java.net/~abakhtin/8241960/webrev.v0/

Regards
Alexey