Checks if replica-s4u2proxy.ldif should be applied
    
    Before applying replica-s3u2proxy.ldif, we check
    if the values are already there. The values can be
    there if a replica installation was done in the past
    and some info was left behind. Also, the code checks
    the values independently.
    
    https://pagure.io/freeipa/issue/7174
    
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>