hg: jdk/sandbox: Use default signature algorithms for TLS 1.2

[xuelei.fan at oracle.com]

Changeset: a0f3377c58c7
Author:    xuelei
Date:      2018-05-21 08:16 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/a0f3377c58c7

Use default signature algorithms for TLS 1.2

! src/java.base/share/classes/sun/security/ssl/Finished.java
! src/java.base/share/classes/sun/security/ssl/SSLExtension.java
! src/java.base/share/classes/sun/security/ssl/SSLExtensions.java
! src/java.base/share/classes/sun/security/ssl/SSLSessionImpl.java
! src/java.base/share/classes/sun/security/ssl/SignatureAlgorithmsExtension.java