The wait_for_zone_is_signed function was never called, which could lead
to test failures due to timing issues (where a zone was not fully signed
yet, but the test was trying to verify the zone).
Also add two missing set_nsec3param calls to ensure the ITERATIONS
value is set for these test cases.
(cherry picked from commit 08505651d1d9278314f61076ac7cd119a7790428)
ba71f93e44