RFR: 8297528: java/io/File/TempDirDoesNotExist.java test failing on windows-x64

[Weibing Xiao]

fix the illegal characters of directory names in Windows

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Commit messages:
 - fix illegal charater of directory name in Windows

Changes: https://git.openjdk.org/jdk/pull/11393/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11393&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297528
  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11393.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11393/head:pull/11393

PR: https://git.openjdk.org/jdk/pull/11393