Do not return broken appliances like ASA 8

gns3server/controller/__init__.py

@@ -67,7 +67,8 @@ class Controller:
         for file in os.listdir(get_resource('appliances')):
             with open(os.path.join(get_resource('appliances'), file)) as f:
                 appliance = ApplianceTemplate(None, json.load(f))
-            self._appliance_templates[appliance.id] = appliance
+            if appliance.status != 'broken':
+                self._appliance_templates[appliance.id] = appliance
 
     @asyncio.coroutine
     def start(self):

gns3server/controller/appliance_template.py

@@ -31,6 +31,10 @@ class ApplianceTemplate:
     def id(self):
         return self._id
 
+    @property
+    def status(self):
+        return self._data["status"]
+
     def __json__(self):
         """
         Appliance data (a hash)