Fix scaling case for the same offering

Author: nvazquez

plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java

@@ -583,7 +583,10 @@ public boolean scaleCluster() throws CloudRuntimeException {
 
     protected boolean isServiceOfferingScalingNeededForNodeType(KubernetesClusterNodeType nodeType,
                                                                 Map<String, ServiceOffering> map, KubernetesCluster kubernetesCluster) {
-        Long existingOfferingId = getExistingOfferingIdForNodeType(nodeType, kubernetesCluster);
+        // DEFAULT node type means only the global service offering has been set for the Kubernetes cluster
+        Long existingOfferingId = map.containsKey(DEFAULT.name()) ?
+                kubernetesCluster.getServiceOfferingId() :
+                getExistingOfferingIdForNodeType(nodeType, kubernetesCluster);
         if (existingOfferingId == null) {
             logAndThrow(Level.ERROR, String.format("The Kubernetes cluster %s does not have a global service offering set", kubernetesCluster.getName()));
         }