Put underscore in-front of alchemist helper
Put underscore in-front of alchemist helper

Since this is a internal helper object we should
put a underscore infront of its class name to make
sure this is obvious (the docstring says the same
thing but this will help).

Change-Id: I3aeb6a178c8ceda0c36d5f5bb57bb765260cbd3c

jimbobhickville/taskflow,pombredanne/taskflow-1,pombredanne/taskflow-1,openstack/taskflow,openstack/taskflow,junneyang/taskflow,jimbobhickville/taskflow,junneyang/taskflow