EUCA-5140: enabling cloudwatch system metrics for loadbalancer
  -- make use of Haproxy's logging facility to retireve the system metrics of interest
  -- use Unix Domain socket to receive the haproxy logs in custom format
  -- keep counting the relevant metrics when it receives logs from haproxy
  -- in every few seconds (10 sec by default) deliver the accumulated metrics to the ELB using PutServoStates operation

commit 10558101669a305aa668e26f9b2f879d0ae15fc9
Author: Sang-Min Park <smpark.uva@gmail.com>
Date:   Fri Mar 22 00:35:50 2013 +0000

    enabling logging in haproxy conf