Bug 829213 - unhashed#user#password visible after changing password
    https://bugzilla.redhat.com/show_bug.cgi?id=829213
    
    Bug 830001 - unhashed#user#password visible after changing password [rhel-6.3]
    https://bugzilla.redhat.com/show_bug.cgi?id=830001
    
    Bug Description: unhashed#user#password is skipped to check acl
    in acl_check_mod.
    
    Fix Description: Set SLAPI_ATTR_FLAG_NOUSERMOD to unhashed#user#
    password schema.  It makes clients' modifying the unhashed password
    fail by UNWILLING TO PERFORM.
    (cherry picked from commit 1629311d7201a6a7842db15865e02042a2894383)