[jdk8u-dev] RFR: 8223396: [TESTBUG] several jfr tests do not clean up files created in /tmp

[Dongbo He]

Hi,

This is a clean backport of [JDK-8223396](https://bugs.openjdk.java.net/browse/JDK-8223396). I'm backporting this as a predecessor of PR #10.

Test:
- [x] jdk_jfr
  EvilInstrument.java test fails. Followup JDK-8230865 backport to fix it.

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Commit messages:
 - Backport 7d3aebccc0b90aa2ca2f656c683fa5931fd0ed3a

Changes: https://git.openjdk.java.net/jdk8u-dev/pull/14/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk8u-dev&pr=14&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8223396
  Stats: 56 lines in 11 files changed: 30 ins; 6 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk8u-dev/pull/14.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk8u-dev pull/14/head:pull/14

PR: https://git.openjdk.java.net/jdk8u-dev/pull/14