RFR 8172017: Two tests sun/security/krb5/auto/ReplayCacheTestProc.java and rcache_usemd5.sh fail on Solaris (Additional pre-authentication required)

[Wang Weijun]

Please take a review at

   http://cr.openjdk.java.net/~weijun/8172017/webrev.00
On Solaris when launched by root, the rcache directory is a little 
different.

I've manually tested this on a Solaris machine, and seen rcache files 
created at different directories when the test was launched by root and 
a normal user.

Thanks
Max