[jdk11u-dev] RFR: 8233403: Improve verbosity of some httpclient tests

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

It applied clean except for the changes to the includes in four of the files. Only context differences.

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Commit messages:
 - Backport eaba9fe23b097338e5d567adec70873a8d4aed8f

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/390/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=390&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233403
  Stats: 169 lines in 5 files changed: 123 ins; 2 del; 44 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/390.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/390/head:pull/390

PR: https://git.openjdk.java.net/jdk11u-dev/pull/390