hg: jdk/jdk15: 8246077: Cloneable test in HmacCore seems questionable

[valerie.peng at oracle.com]

Changeset: 80cbb6242147
Author:    valeriep
Date:      2020-06-15 23:30 +0000
URL:       https://hg.openjdk.java.net/jdk/jdk15/rev/80cbb6242147

8246077: Cloneable test in HmacCore seems questionable
Summary: Updated java.security.MessageDigest and Signature classes to return Cloneable obj for Cloneable spi obj
Reviewed-by: weijun, xuelei, coffeys

! src/java.base/share/classes/com/sun/crypto/provider/HmacCore.java
! src/java.base/share/classes/java/security/MessageDigest.java
! src/java.base/share/classes/java/security/Signature.java
! src/java.base/share/classes/sun/security/provider/DigestBase.java
+ test/jdk/com/sun/crypto/provider/Mac/DigestCloneabilityTest.java
+ test/jdk/java/security/MessageDigest/TestCloneable.java
+ test/jdk/java/security/Signature/TestCloneable.java