Add ACIs for Dogtag custodia client
The "dogtag/$HOSTNAME@$REALM" service principal uses Custodia to
retrieve lightweight CA signing keys, and therefore needs search and
read access to Custodia keys. Add an ACI to permit this.
Also add ACIs to allow host principals to manage Dogtag custodia
keys for the same host.
Part of: https://fedorahosted.org/freeipa/ticket/4559
Reviewed-By: Jan Cholasta <jcholast@redhat.com>