Shutting down container stat threads in shutdown hook (#21)

dockerplugin.py

@@ -620,6 +620,10 @@ def read_callback(self):
                                '{container}: {msg}')
                               .format(container=_c(container), msg=e))
 
+    def stop_all(self):
+        for stat_thread in self.stats.values():
+            stat_thread.stop = True
+
 
 class CollectdLogHandler(logging.Handler):
     """Log handler to forward statements to collectd
@@ -705,6 +709,8 @@ def shutdown():
     log.info("dockerplugin shutting down")
     log.removeHandler(handle)
 
+    plugin.stop_all()
+
 
 # Set up logging
 logging.setLoggerClass(CollectdLogger)