RFR: 8311631: When multiple users run tools/jpackage/share/LicenseTest.java, Permission denied for writing /var/tmp/*.files

[yaqsun]

Low risk, only test changes.
The prerequisite is to install the rpmbuild command, when multiple users switch to write /var/tmp/*.files will have the permission forbidden.

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Commit messages:
 - 8311631: When multiple users run tools/jpackage/share/LicenseTest.java, Permission denied for writing /var/tmp/*.files.

Changes: https://git.openjdk.org/jdk/pull/14802/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14802&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311631
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14802.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14802/head:pull/14802

PR: https://git.openjdk.org/jdk/pull/14802