Patch in: 429fe19368251e63fe372995118c91747124fc4f

commit 429fe19368251e63fe372995118c91747124fc4f
Author: Megh Bhatt <meghb@juniper.net>
Date:   Tue Jan 14 15:44:50 2014 -0800

    Add mock_generator to simulate vrouter sending sandesh messages to
    collector.