Fix API status code for start/stop/suspend/reload a node. Fixes #1353.

Fix issues with test.
Update documentation.

docs/api/v2/controller/project/projectsprojectid.rst

@@ -99,8 +99,8 @@ Parameters
 
 Response status codes
 **********************
-- **204**: Changes have been written on disk
 - **404**: The project doesn't exist
+- **204**: Changes have been written on disk
 
 Sample session
 ***************

docs/api/v2/controller/project/projectsprojectidclose.rst

@@ -13,8 +13,8 @@ Parameters
 
 Response status codes
 **********************
-- **204**: The project has been closed
 - **404**: The project doesn't exist
+- **204**: The project has been closed
 
 Output
 *******