RFR: 8256216: Enable reproducible builds in jib-profiles

[Magnus Ihse Bursie]

The time has come to actually turn on the support for reproducible builds by default in the jib profiles.

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Commit messages:
 - 8256216: Enable reproducible builds in jib-profiles

Changes: https://git.openjdk.java.net/jdk/pull/1176/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1176&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256216
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1176.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1176/head:pull/1176

PR: https://git.openjdk.java.net/jdk/pull/1176