Corefile: Drop deprecated kubernetes upstream option

coredns/coredns#3737 removed the unused `upstream` kubernetes plugin option from the CoreDNS corefile parser. Starting in CoreDNS v1.7, corefiles that have the `upstream` option will throw an error. This change should not affect functionality since the `upstream` option has been ignored since CoreDNS v1.5. The aforementioned upstream CoreDNS PR merely requires that the `upstream` option be removed for the kubernetes plugin section of a corefile.
sgreene570 · Feb 24, 2021 · 742481c · 742481c
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diff --git a/pkg/operator/controller/controller_dns_configmap.go b/pkg/operator/controller/controller_dns_configmap.go
@@ -34,7 +34,6 @@ var corefileTemplate = template.Must(template.New("Corefile").Parse(`{{range .Se
     health
     kubernetes {{.ClusterDomain}} in-addr.arpa ip6.arpa {
         pods insecure
-        upstream
         fallthrough in-addr.arpa ip6.arpa
     }
     prometheus 127.0.0.1:9153

diff --git a/pkg/operator/controller/controller_dns_configmap_test.go b/pkg/operator/controller/controller_dns_configmap_test.go
@@ -46,7 +46,6 @@ bar.com:5353 example.com:5353 {
     health
     kubernetes cluster.local in-addr.arpa ip6.arpa {
         pods insecure
-        upstream
         fallthrough in-addr.arpa ip6.arpa
     }
     prometheus 127.0.0.1:9153