[jdk11u-dev] RFR: 8212695: Add explicit timeout to several HTTP Client tests

[Christoph Langer]

Backport of JDK-8212695. I had to make adjustments because JDK-8222527 was already backported.

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Commit messages:
 - Backport cea4eef60aadf7dceb1fa857722faa8b17c810ae

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/294/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=294&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8212695
  Stats: 27 lines in 2 files changed: 12 ins; 0 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/294.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/294/head:pull/294

PR: https://git.openjdk.java.net/jdk11u-dev/pull/294