Drop the commit system

Ref https://github.com/GNS3/gns3-gui/issues/1243

gns3server/controller/project.py

@@ -273,11 +273,6 @@ class Project:
             yield from compute.post("/projects/{}/close".format(self._id))
         self._allocated_node_names.clear()
 
-    @asyncio.coroutine
-    def commit(self):
-        for compute in self._project_created_on_compute:
-            yield from compute.post("/projects/{}/commit".format(self._id))
-
     @asyncio.coroutine
     def delete(self):
         yield from self.close()