Reviewer needed - fix for regression test LastErrorString

[Pavel Tisnovsky]

Hi all,

I'd like to push fix for regression test
java/io/IOException/LastErrorString.java to OpenJDK7 and OpenJDK6. This
fix ensures that no system-important files can be erased and/or
rewritten by this test even if root started JTreg. Fixed test also tries
all various combinations of file attributes.

Webrev is available at:
http://cr.openjdk.java.net/~ptisnovs/jtreg-jdk-test-LastErrorString-fix/

Can anybody please review it?

Thank you in advance,
Pavel Tisnovsky