[crac] RFR: 8377562: [CRaC] Add better logging to RemoteJmxTest [v3]

[Timofei Pushkin]

> Makes `RemoteJmxTest` log stderr of the child process.

Timofei Pushkin has updated the pull request incrementally with one additional commit since the last revision:

  Apply reviewer's suggestions

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Changes:
  - all: https://git.openjdk.org/crac/pull/295/files
  - new: https://git.openjdk.org/crac/pull/295/files/c355f325..3135c6ae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=295&range=02
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=295&range=01-02

  Stats: 57 lines in 4 files changed: 16 ins; 13 del; 28 mod
  Patch: https://git.openjdk.org/crac/pull/295.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/295/head:pull/295

PR: https://git.openjdk.org/crac/pull/295