[jdk8u-dev] RFR: 8276139: TestJpsHostName.java not reliable, better to expand HostIdentifierCreate.java test

[yaqsun]

I backport JDK-8251155 and JDK-8276139.
Apply clean except for test path. And test have been locally verified to pass.

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Commit messages:
 - Backport 2af9e5976fdf94afc7dbe5ad7827553818057bae
 - Backport 2af9e5976fdf94afc7dbe5ad7827553818057bae
 - Backport 2af9e5976fdf94afc7dbe5ad7827553818057bae

Changes: https://git.openjdk.org/jdk8u-dev/pull/411/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=411&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8276139
  Stats: 21 lines in 3 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/411.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/411/head:pull/411

PR: https://git.openjdk.org/jdk8u-dev/pull/411