m/n/core/consensus: remove unused variable

Change-Id: I84e034adcd9ec956b91bba16e40d06a3ae40a846
Reviewed-on: https://review.monogon.dev/c/monogon/+/2951
Vouch-Run-CI: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/metropolis/node/core/consensus/configuration.go b/metropolis/node/core/consensus/configuration.go
index f7fe954..1dc927f 100644
--- a/metropolis/node/core/consensus/configuration.go
+++ b/metropolis/node/core/consensus/configuration.go
@@ -91,10 +91,8 @@
 		port = p
 	}
 	host := nodeID
-	var extraNames []string
 	if c.testOverrides.externalAddress != "" {
 		host = c.testOverrides.externalAddress
-		extraNames = append(extraNames, host)
 	}
 	etcdPort := int(node.MetricsEtcdListenerPort)
 	if p := c.testOverrides.etcdMetricsPort; p != 0 {