ignore casing for MC prefix (#536)

Author: akshaysngupta

pkg/azure/azure.go

@@ -41,7 +41,7 @@ func ConvertToClusterResourceGroup(subscriptionID SubscriptionID, resourceGroup
 	}
 
 	split := strings.Split(string(resourceGroup), "_")
-	if len(split) != 4 || split[0] != "MC" {
+	if len(split) != 4 || strings.ToUpper(split[0]) != "MC" {
 		logLine := fmt.Sprintf("infrastructure resource group name: %s is expected to be of format MC_ResourceGroup_ResourceName_Location", string(resourceGroup))
 		return "", errors.New(logLine)
 	}

pkg/azure/azure_test.go

@@ -45,6 +45,10 @@ var _ = Describe("Azure", func() {
 				subID := SubscriptionID("xxxx")
 				resGp := ResourceGroup("MC_resgp_resName_location")
 				Expect(ConvertToClusterResourceGroup(subID, resGp, nil)).To(Equal("/subscriptions/xxxx/resourcegroups/resgp/providers/Microsoft.ContainerService/managedClusters/resName"))
+
+				subID = SubscriptionID("xxxx")
+				resGp = ResourceGroup("mc_resgp_resName_location")
+				Expect(ConvertToClusterResourceGroup(subID, resGp, nil)).To(Equal("/subscriptions/xxxx/resourcegroups/resgp/providers/Microsoft.ContainerService/managedClusters/resName"))
 			})
 		})
 	})