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

[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

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Commit messages:
 - Backport 158b93d19a518d2b9d3d185e2d4c4dbff9c82aab

Changes: https://git.openjdk.org/jdk8u-dev/pull/608/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=608&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335912
  Stats: 497 lines in 4 files changed: 495 ins; 0 del; 2 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