Don't try to convert a host's password into a keytab.
    
    The migration plugin uses a pre-op function to automatically create
    kerberos credentials when binding using a password.
    
    The problem is that we do a simple bind when doing password-base
    host enrollment. This was causing krbPasswordExpiration to be set
    which isn't what we want for hosts. They really shouldn't go through
    this code at all.