Close project if one one the compute of the project is down

Fix #836

gns3server/controller/__init__.py

@@ -270,6 +270,15 @@ class Controller:
             self.notification.emit("compute.updated", self._computes[compute_id].__json__())
             return self._computes[compute_id]
 
+    @asyncio.coroutine
+    def close_compute_projects(self, compute):
+        """
+        Close projects running on a compute
+        """
+        for project in self._projects.values():
+            if compute in project.computes:
+                yield from project.close()
+
     @asyncio.coroutine
     def delete_compute(self, compute_id):
         """
@@ -281,11 +290,7 @@ class Controller:
             compute = self.get_compute(compute_id)
         except aiohttp.web.HTTPNotFound:
             return
-
-        for project in self._projects.values():
-            if compute in project.computes:
-                yield from project.close()
-
+        yield from self.close_compute_projects(compute)
         yield from compute.close()
         del self._computes[compute_id]
         self.save()