[jdk11u-dev] RFR: 8223396: [TESTBUG] several jfr tests do not clean up files created in /tmp

[Zhengyu Gu]

I would like to backport this patch to 11u for reducing noise on JDK-8231111. 

The original patch does not apply cleanly, due to out-of-order backport of JDK-8202142.

Test:

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

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Commit messages:
 - Remove whitespaces
 - Backport 7d3aebccc0b90aa2ca2f656c683fa5931fd0ed3a

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/901/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=901&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8223396
  Stats: 51 lines in 11 files changed: 30 ins; 5 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/901.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/901/head:pull/901

PR: https://git.openjdk.java.net/jdk11u-dev/pull/901