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

[Daniel Fuchs]

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

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Commit messages:
 - 8266646: Add more diagnostic to java/lang/System/LoggerFinder/modules

Changes: https://git.openjdk.java.net/jdk/pull/3904/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3904&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266646
  Stats: 38 lines in 4 files changed: 27 ins; 2 del; 9 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