Add a Net::DNS prereq for couple of tests
Add prereq tests for digdelv, fetchlimit, rpzrecurse, and zero to avoid failed tests when Net::DNS is not present.
(cherry picked from commit 8b1b809a)
Add prereq tests for digdelv, fetchlimit, rpzrecurse, and zero to avoid failed tests when Net::DNS is not present.
(cherry picked from commit 8b1b809a)