Make sure CreateNetwork still works on ACS < 4.18

Author: hrak

pkg/cloud/isolated_network.go

@@ -101,6 +101,7 @@ func (c *client) CreateIsolatedNetwork(fd *infrav1.CloudStackFailureDomain, isoN
 
 	// Do isolated network creation.
 	p := c.cs.Network.NewCreateNetworkParams(isoNet.Spec.Name, offeringID, fd.Spec.Zone.ID)
+	p.SetDisplaytext(isoNet.Spec.Name)
 	resp, err := c.cs.Network.CreateNetwork(p)
 	if err != nil {
 		c.customMetrics.EvaluateErrorAndIncrementAcsReconciliationErrorCounter(err)