preventing ldap principal to be deleted
    
    ipa-server-install --uninstall command is calling server-del to
    delete replica. This scenario does not work since server-del
    is also deleting all principals from and ldap breaking ldap
    replication. As a result, only part of deletions are propagated
    to the other replicals leaving a lot of orphaned data there.
    
    https://pagure.io/freeipa/issue/7371
    
    This patch won't fully fix the issue with left-over data
    but more data is cleaned up and only ldap principal is left
    thus ending in a better state.
    Issue will be fully fixed only when topology plugin is patched
    as well. The following pagure ticket is created to track
    topology plugin change:
    https://pagure.io/freeipa/issue/7359
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>