Align error message with others

Author: Qqkyu

kubetest2-gke/deployer/deployer.go

@@ -57,8 +57,6 @@ const (
 	unrestricted privateClusterAccessLevel = "unrestricted"
 )
 
-type subnetMode string
-
 var (
 	// poolRe matches instance group URLs of the form `https://www.googleapis.com/compute/v1/projects/some-project/zones/a-zone/instanceGroupManagers/gke-some-cluster-some-pool-90fcb815-grp`
 	// or `https://www.googleapis.com/compute/v1/projects/some-project/zones/a-zone/instanceGroupManagers/gk3-some-cluster-some-pool-90fcb815-grp` for GKE in Autopilot mode.

kubetest2-gke/deployer/network.go

@@ -75,7 +75,7 @@ func (d *Deployer) VerifyNetworkFlags() error {
 		}
 
 		if !d.UseCustomSubnetMode {
-			return errors.New("multi-project deployments have to use custom subnet mode")
+			return errors.New("the 'auto' subnet mode cannot be used for multi-project profile")
 		}
 	}