DNSSEC: ipa-dnskeysyncd: Skip zones with old DNSSEC metadata in LDAP
This filtering is useful in cases where LDAP contains DNS zones which
have old metadata objects and DNSSEC disabled. Such zones must be
ignored to prevent errors while calling dnssec-keyfromlabel or rndc.
https://fedorahosted.org/freeipa/ticket/5348
Reviewed-By: Martin Basti <mbasti@redhat.com>