DNSSEC CI tests
Tests:
* install master, replica, then instal DNSSEC on master
* test if zone is signed (added on master)
* test if zone is signed (added on replica)
* install master with DNSSEC, then install replica
* test if root zone is signed
* add zone, verify signatures using our root zone
https://fedorahosted.org/freeipa/ticket/4657
Reviewed-By: Milan Kubik <mkubik@redhat.com>