delete stale cncf AWS test records

Author: BenTheElder

dns/zone-configs/k8s.io._2_aws.yaml

@@ -1,11 +1,4 @@
 # Kops testing e2e (@justinsb).
-test-cncf-aws:
-  type: NS
-  values:
-  - ns-1458.awsdns-54.org.
-  - ns-1825.awsdns-36.co.uk.
-  - ns-265.awsdns-33.com.
-  - ns-687.awsdns-21.net.
 tests-kops-aws:
   type: NS
   values: