[jdk17u-dev] RFR: 8285915: failure_handler: gather the contents of /etc/hosts file

[Goetz Lindenmaier]

I backport this for parity with 17.0.18-oracle

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Commit messages:
 - Backport 45ca81ff5f25ce7927c5debc2f89b41246b91b92

Changes: https://git.openjdk.org/jdk17u-dev/pull/3929/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3929&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285915
  Stats: 13 lines in 3 files changed: 10 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3929.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3929/head:pull/3929

PR: https://git.openjdk.org/jdk17u-dev/pull/3929