[jdk23u] RFR: 8339787: Add some additional diagnostic output to java/net/ipv6tests/UdpTest.java

[Shivangi Gupta]

Straight Backport. Good to backport. Test is passing

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Commit messages:
 - Backport  cecb0b3d11ed0ce204cb6c3427f5a6858a844aeb

Changes: https://git.openjdk.org/jdk23u/pull/174/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=174&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339787
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk23u/pull/174.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/174/head:pull/174

PR: https://git.openjdk.org/jdk23u/pull/174