Need to remove dependency of Kerberos on sun.io package.

[ Xueming Shen ]
sun.io is a deprecated internal package for charset conversion, it is replaced by java.nio.charset from 1.4, all encoding/charsets supported in sun.io have been migrated/reimplemented in java.nio/charsets, it's been decided to remove this package from j2se ws in mustang.

Refer to following bug for details:
6237353: Remove sun.io package from j2se binary

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