[jdk25u] RFR: 8359477: com/sun/net/httpserver/Test12.java appears to have a temp file race

[Anawesha Khuntia]

Straight Backport 
Ran the tests under 
1) open/test/jdk/java/net/
2) open/test/jdk/com/sun/net/httpserver/

for windows, macos and linux and the tests have passed

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Commit messages:
 - Backport e1681c48287bcce6c8f617d9c0c25354dd62870a

Changes: https://git.openjdk.org/jdk25u/pull/266/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=266&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359477
  Stats: 152 lines in 2 files changed: 46 ins; 68 del; 38 mod
  Patch: https://git.openjdk.org/jdk25u/pull/266.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/266/head:pull/266

PR: https://git.openjdk.org/jdk25u/pull/266