[jdk11u] RFR: 8229888: (zipfs) Updating an existing zip file does not preserve original permissions

[Baesken, Matthias]

Hello, please  review the downport of
8229888: (zipfs) Updating an existing zip file does not preserve original permissions

to jdk11u. The change is in 11.0.7-oracle so it would be good to have it in OpenJDK 11 as well.

The change touches src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java  and test related files.
I had to add imports to ZipFileSystem.java, and had to adjust the test file  test/jdk/jdk/nio/zipfs/ZipFSPermissionsTest.java
because jdk11   misses  java.nio.file.FileSystems.newFileSystem(Path path, Map<String,?> env) .


bug :
https://bugs.openjdk.java.net/browse/JDK-8229888


original jdk/jdk change :
https://hg.openjdk.java.net/jdk/jdk/rev/798c0903fcd0


adjusted jdk11u change :
http://cr.openjdk.java.net/~mbaesken/webrevs/8229888_0_jdk11/


Thanks, Matthias