Make the worker banner template part of the worker class
Make the worker banner template part of the worker class

Instead of having the banner template be part of the
worker module, have it be part of the worker class so that
anyone that desires to subclass and create new workers can
alter the banner template more easily (if they so choose).

Change-Id: Id56815ffd726f8952a74f9ab866b1bd006dcfcad

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