RFR: 8266646: Add more diagnostic to java/lang/System/LoggerFinder/modules [v2]

[Daniel Fuchs]

> Hi, please find here a trivial test change that adds some diagnostic (time stamps) to the LoggerFinder/modules subprocess test logs.

Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision:

  Use + Instant.now(); Instant.toString() uses the same formatter as ISO_INSTANT.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3904/files
  - new: https://git.openjdk.java.net/jdk/pull/3904/files/f027f8e0..3e6b436c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3904&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3904&range=00-01

  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3904.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3904/head:pull/3904

PR: https://git.openjdk.java.net/jdk/pull/3904