hg: jdk/sandbox: 8230117: Remove unused JAR tool classes

[chris.hegarty at oracle.com]

Changeset: d9dd1627e074
Author:    lancea
Date:      2020-03-11 12:30 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/d9dd1627e074

8230117: Remove unused JAR tool classes
Reviewed-by: lancea, clanger
Contributed-by: Adam Sotona <adam.sotona at oracle.com>

- src/jdk.jartool/share/classes/sun/tools/jar/Manifest.java
- src/jdk.jartool/share/classes/sun/tools/jar/SignatureFile.java