hg: jdk/sandbox: 8229888: (zipfs) Updating an existing zip file does not preserve original permissions

[chris.hegarty at oracle.com]

Changeset: 798c0903fcd0
Author:    lancea
Date:      2019-12-18 12:03 -0500
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/798c0903fcd0

8229888: (zipfs) Updating an existing zip file does not preserve original permissions
Reviewed-by: clanger, alanb, bpb

! src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java
+ test/jdk/jdk/nio/zipfs/ZipFSPermissionsTest.java
+ test/jdk/jdk/nio/zipfs/ZipFSPermissionsTest.policy