hg: jdk/sandbox: integer overflow, remove ununsed code and comments

[xuelei.fan at oracle.com]

Changeset: e57205a6e4ee
Author:    xuelei
Date:      2018-05-31 15:37 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/e57205a6e4ee

integer overflow, remove ununsed code and comments

! src/java.base/share/classes/sun/security/ssl/DTLSInputRecord.java
! src/java.base/share/classes/sun/security/ssl/HandshakeHash.java
! src/java.base/share/classes/sun/security/ssl/KeyManagerFactoryImpl.java
! src/java.base/share/classes/sun/security/ssl/SSLEngineImpl.java
! src/java.base/share/classes/sun/security/ssl/SSLExtension.java
! src/java.base/share/classes/sun/security/ssl/SSLSecretDerivation.java
! src/java.base/share/classes/sun/security/ssl/SSLTrafficKeyDerivation.java