metropolis/cli/metroctl: don't print usage for runtime errors

Change-Id: I91fdca45e874ea1ec9112df556a9a7392fd45bfd
Fixes: https://github.com/monogon-dev/monogon/issues/352
Reviewed-on: https://review.monogon.dev/c/monogon/+/3440
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/cli/metroctl/cmd_k8s_configure.go b/metropolis/cli/metroctl/cmd_k8s_configure.go
index c238cdf..cd90416 100644
--- a/metropolis/cli/metroctl/cmd_k8s_configure.go
+++ b/metropolis/cli/metroctl/cmd_k8s_configure.go
@@ -23,7 +23,7 @@
 	Long: `Configures a local kubectl instance (or any other Kubernetes application)
 to connect to a Metropolis cluster. A cluster endpoint must be provided with the
 --endpoints parameter.`,
-	Args: cobra.ExactArgs(0),
+	Args: PrintUsageOnWrongArgs(cobra.ExactArgs(0)),
 	Run:  doK8sConfigure,
 }