RFR 8156471: test/sun/security/krb5/auto/TestHosts should not be modified in-place

[Wang Weijun]

Please review the change at

  http://cr.openjdk.java.net/~weijun/8156471/webrev.00/

Mark, I noticed a strange "irlga09" host name at the end of TestHosts [1]. Is it happened to be one of your test machines and you've added it with this test? I can remove it in this fix.

Thanks
Max

[1] http://cr.openjdk.java.net/~msheppar/8134577/webrev.10/test/sun/security/krb5/auto/TestHosts.html