[crac] RFR: Fix test when running as root

[Radim Vansa]

Root can reopen the file even without permissions.

-------------

Commit messages:
 - Fix test when running as root

Changes: https://git.openjdk.org/crac/pull/128/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=128&range=00
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/128.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/128/head:pull/128

PR: https://git.openjdk.org/crac/pull/128