RFR 8201867: Kerberos keytabs with holes in certain places are parsed incorrectly

[Weijun Wang]

Please take a review at

  http://cr.openjdk.java.net/~weijun/8201867/webrev.00/

When the hole in keytab is right on the 8192 buffer boundary, skip(n) does not return n.

I are not sure if I can do something like "while (i < n) i += skip(n)" because skip(n) can return zero and it does not understand EOF. Therefore I readNBytes(n) and discard the result. If you have a better solution, I'll be happy to know.

Thanks
Max