utils: Returns timestamp as an integer.

This is used for serialisation, and there is no need for sub-second
precision.

caucase/utils.py

@@ -443,7 +443,7 @@ def datetime2timestamp(value):
   """
   Convert given datetime into a unix timestamp.
   """
-  return (value - EPOCH).total_seconds()
+  return int((value - EPOCH).total_seconds())
 
 def timestamp2IMFfixdate(value):
   """