Fix import of resource group name for azurerm_network_security_group.

builtin/providers/azurerm/import_arm_network_security_group_test.go

@@ -19,10 +19,9 @@ func TestAccAzureRMNetworkSecurityGroup_importBasic(t *testing.T) {
 			},
 
 			resource.TestStep{
-				ResourceName:            resourceName,
-				ImportState:             true,
-				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"resource_group_name"},
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
 			},
 		},
 	})

builtin/providers/azurerm/resource_arm_network_security_group.go

@@ -203,6 +203,7 @@ func resourceArmNetworkSecurityGroupRead(d *schema.ResourceData, meta interface{
 		d.Set("security_rule", flattenNetworkSecurityRules(resp.Properties.SecurityRules))
 	}
 
+	d.Set("resource_group_name", resGroup)
 	d.Set("name", resp.Name)
 	d.Set("location", resp.Location)
 	flattenAndSetTags(d, resp.Tags)