Support for Microsoft Set Password protocol

[Sam Hartman]

>>>>> "Nicolas" == Nicolas Williams <Nicolas.Williams at sun.com> writes:

    Nicolas> A change keys API will also be needed.  Inputs?  A
    Nicolas> principal name, a keytab name, an optional list of
    Nicolas> enctypes and a flag/kvno indicating whether to remove old
    Nicolas> keytab entries.  Outputs?  Success/failure.  Side
    Nicolas> effects?  New keytab entries.

Yes, but designing that API now seems wrong since we clearly have no
implementation.