dns: added test for checking dnssec opts in resolv.conf

Added @dns_dnsmasq_dnssec_options and @dns_resolved_dnssec options that check if 'edns0' and 'trust-ad' options are added to resolv.conf when using systemd-resolved or dnsmasq

https://bugzilla.redhat.com/show_bug.cgi?id=1878166