[schema][manual] Add South migration for flags on UserMessage

(imported from commit bdf6cf2d5427709e52ef051e3c4a19c5fbb4851c)

zephyr/lib/utils.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from time import sleep
+
+# Runs the callback with slices of all_list of a given batch_size
+def run_in_batches(all_list, batch_size, callback, sleep_time = 0, logger = None):
+    if len(all_list) == 0:
+        return
+
+    limit = (len(all_list) / batch_size) + 1;
+    for i in xrange(limit):
+        start = i*batch_size
+        end = (i+1) * batch_size
+        if end >= len(all_list):
+            end = len(all_list)
+        batch = all_list[start:end]
+
+        if logger:
+            logger("Executing %s in batch %s of %s" % (end-start, i+1, limit))
+
+        callback(batch)
+        sleep(sleep_time)