[jdk11u-dev] RFR: 8220575: Correctly format test URI's that contain a retrieved IPv6 address

[Christoph Langer]

Backport of JDK-8220575.

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Commit messages:
 - Backport 0c2b7c4fc3549bb2c44777093fa6588c9da451e1

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/547/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=547&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8220575
  Stats: 250 lines in 24 files changed: 204 ins; 2 del; 44 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/547.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/547/head:pull/547

PR: https://git.openjdk.java.net/jdk11u-dev/pull/547