[jdk8u-dev] RFR: 8335912: Add an operation mode to the jar command when extracting to not overwriting existing files [v4]

[Alexey Bakhtin]

> Not clean backport from JDK11 patch:
> - No GNUStyle options in JDK8
> - No support for long options
> - Tests updated to use JDK8 API
> - Removed subtest for long option
> 
> JTREG tests passed

Alexey Bakhtin has updated the pull request incrementally with one additional commit since the last revision:

  Fix ExtractFilesTest test

-------------

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/608/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/608/files/bdb6cf46..a99b5b5e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=608&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=608&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/608.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/608/head:pull/608

PR: https://git.openjdk.org/jdk8u-dev/pull/608