Fix import of resource group name for azurerm_virtual_network.

builtin/providers/azurerm/import_arm_virtual_network_test.go

@@ -27,7 +27,6 @@ func TestAccAzureRMVirtualNetwork_importBasic(t *testing.T) {
 				ResourceName:      resourceName,
 				ImportState:       true,
 				ImportStateVerify: true,
-				ImportStateVerifyIgnore: []string{"resource_group_name"},
 			},
 		},
 	})

builtin/providers/azurerm/resource_arm_virtual_network.go

@@ -142,6 +142,7 @@ func resourceArmVirtualNetworkRead(d *schema.ResourceData, meta interface{}) err
 	vnet := *resp.Properties
 
 	// update appropriate values
+	d.Set("resource_group_name", resGroup)
 	d.Set("name", resp.Name)
 	d.Set("location", resp.Location)
 	d.Set("address_space", vnet.AddressSpace.AddressPrefixes)