RFR: 8276764: Enable deterministic file content ordering for Jar and Jmod

[Andrew Leonard]

Both jar and jmod utilise java.io file operations whose methods define no ordering of the return file lists, and in fact rely on OS query file ordering, which can differ by underlying OS architecture.
This PR adds sort processing to the creation of such jar's and jmod's to enable a deterministic content ordering.

Signed-off-by: Andrew Leonard <anleonar at redhat.com>

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Commit messages:
 - 8276764: Enable deterministic file content ordering for Jar and Jmod

Changes: https://git.openjdk.java.net/jdk/pull/6395/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6395&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276764
  Stats: 209 lines in 4 files changed: 199 ins; 2 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6395.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6395/head:pull/6395

PR: https://git.openjdk.java.net/jdk/pull/6395