Merge pull request #2687 from IamTheFij/fix-model-plugin-upgrade-reload

Fix plugin model upgrade

Author: aiordache

docker/models/plugins.py

@@ -119,7 +119,7 @@ def upgrade(self, remote=None):
         privileges = self.client.api.plugin_privileges(remote)
         for d in self.client.api.upgrade_plugin(self.name, remote, privileges):
             yield d
-        self._reload()
+        self.reload()
 
 
 class PluginCollection(Collection):