removing default for KUBECONFIG to enable in cluster tests (#2191)

test/e2e_flags.go

@@ -24,7 +24,6 @@ import (
 	"flag"
 	"text/template"
 
-	"k8s.io/client-go/tools/clientcmd"
 	env "knative.dev/pkg/environment"
 	testenv "knative.dev/pkg/test/environment"
 	"knative.dev/pkg/test/logging"
@@ -50,13 +49,6 @@ func initializeFlags() *EnvironmentFlags {
 	f.ClientConfig.InitFlags(flag.CommandLine)
 	f.TestClientConfig.InitFlags(flag.CommandLine)
 
-	// We want to do this defaulting for tests only. The flags are reused between tests
-	// and production code and we want to make sure that production code defaults to
-	// the in-cluster config correctly.
-	if f.Kubeconfig == "" {
-		f.Kubeconfig = clientcmd.RecommendedHomeFile
-	}
-
 	return f
 }