RFR: 8276766: Enable jar and jmod to produce deterministic timestamped content [v13]

[Andrew Leonard]

> Add a new --source-date <TIMESTAMP> (epoch seconds) option to jar and jmod to allow specification of time to use for created/updated jar/jmod entries. This then allows the ability to make the content deterministic.
> 
> Signed-off-by: Andrew Leonard <anleonar at redhat.com>

Andrew Leonard has updated the pull request incrementally with two additional commits since the last revision:

 - 8276766: Enable jar and jmod to produce deterministic timestamped content
   
   Signed-off-by: Andrew Leonard <anleonar at redhat.com>
 - 8276766: Enable jar and jmod to produce deterministic timestamped content
   
   Signed-off-by: Andrew Leonard <anleonar at redhat.com>

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6481/files
  - new: https://git.openjdk.java.net/jdk/pull/6481/files/283e435a..c84bc5ad

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6481&range=12
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6481&range=11-12

  Stats: 58 lines in 1 file changed: 50 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6481.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6481/head:pull/6481

PR: https://git.openjdk.java.net/jdk/pull/6481