adding forgotten balancer lock state restore

Author: Tim Vaillancourt

MongoBackup/Backup.py

@@ -143,6 +143,9 @@ def cleanup_and_exit(self, code, frame):
         if current_process().name == "MainProcess":
             logging.info("Starting cleanup and exit procedure! Killing running threads")
 
+            if self.sharding:
+                self.sharding.restore_balancer_state()
+
             submodules = ['replset', 'sharding', 'mongodumper', 'oplogtailer', 'archiver', 'uploader_s3']
             for submodule_name in submodules:
                 submodule = getattr(self, submodule_name)