Adding versioning in thread pool name, so that thread pool chnages are reflected when we reinit or reload any task handler.
Adding versioning in thread pool name, so that thread pool chnages are reflected when we reinit or reload any task handler.

Summary: Log changes for thread pool reinit

Test Plan: NA

Differential Revision: http://phabricator.corp.flipkart.com/D6416
Removing unused method and default threadpool name not to be versioned
Changes for handler config version set and logs