DNSSEC: ipa-dnskeysyncd: call ods-signer ldap-cleanup on zone removal
    
    Command "ldap-cleanup <zone name>" is called to remove all key metadata from
    LDAP. This command is now called when disabling DNSSEC on a DNS zone. The stale
    metadata were causing problems when re-enabling DNSSEC on the same zone.
    
    https://fedorahosted.org/freeipa/ticket/5348
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>