[spec] New Tasks Configuration section - hook
[spec] New Tasks Configuration section - hook

This document describes new section in task config.
This changes needed for reliability and density testing
of OpenStack clusters.

Change-Id: I39fed4b820710b74cf902363dd1c683622f89ca7

openstack/rally,yeming233/rally,vganapath/rally,vganapath/rally,vganapath/rally,vganapath/rally,openstack/rally,openstack/rally,yeming233/rally,openstack/rally