Use vnet resource group

Author: willie-yao

azure/scope/cluster.go

@@ -558,7 +558,7 @@ func (s *ClusterScope) AzureBastion() *infrav1.AzureBastion {
 // AzureBastionSpec returns the bastion spec.
 func (s *ClusterScope) AzureBastionSpec() azure.ASOResourceSpecGetter[*asonetworkv1api20220701.BastionHost] {
 	if s.IsAzureBastionEnabled() {
-		subnetID := azure.SubnetID(s.SubscriptionID(), s.ResourceGroup(), s.Vnet().Name, s.AzureBastion().Subnet.Name)
+		subnetID := azure.SubnetID(s.SubscriptionID(), s.Vnet().ResourceGroup, s.Vnet().Name, s.AzureBastion().Subnet.Name)
 		publicIPID := azure.PublicIPID(s.SubscriptionID(), s.ResourceGroup(), s.AzureBastion().PublicIP.Name)
 
 		return &bastionhosts.AzureBastionSpec{

azure/scope/cluster_test.go

@@ -1805,7 +1805,7 @@ func TestAzureBastionSpec(t *testing.T) {
 				Location:      "centralIndia",
 				ClusterName:   "my-cluster",
 				SubnetID: fmt.Sprintf("/subscriptions/%s/resourceGroups/%s/providers/Microsoft.Network/"+
-					"virtualNetworks/%s/subnets/%s", "123", "my-rg", "fake-vnet-1", "fake-bastion-subnet-1"),
+					"virtualNetworks/%s/subnets/%s", "123", "my-rg-vnet", "fake-vnet-1", "fake-bastion-subnet-1"),
 				PublicIPID: fmt.Sprintf("/subscriptions/%s/resourceGroups/%s/providers/Microsoft.Network/"+
 					"publicIPAddresses/%s", "123", "my-rg", "fake-public-ip-1"),
 			},