Added background calculation for plugins tags

cloudcontrol/node/host/plugins.py

@@ -60,10 +60,11 @@ class Plugin(object):
             # prevents module from being garbage collected
             self.module = module
 
-    def _decorator_tag(self, ttl=-1, refresh=None, name=None):
+    def _decorator_tag(self, ttl=-1, refresh=None, name=None, background=False):
         def decorator(func):
             tag = Tag(func.__name__ if name is None else name,
-                      lambda: taggify(func()), ttl=ttl, refresh=refresh)
+                      lambda: taggify(func()), ttl=ttl, refresh=refresh,
+                      background=background)
             self.tags.append(tag)
             return _tag_direct_use_error
         return decorator