Add a setup.cfg keywords to describe taskflow
Add a setup.cfg keywords to describe taskflow

Include keywords that will be searchable on
pypi (and any indexing sites) that describe
in single words what taskflow is all about.

Change-Id: I8971707044e92e330fed73c485f10ecd5244445f

pombredanne/taskflow-1,citrix-openstack-build/taskflow,varunarya10/taskflow,junneyang/taskflow,pombredanne/taskflow-1,citrix-openstack-build/taskflow,jimbobhickville/taskflow,varunarya10/taskflow,junneyang/taskflow,openstack/taskflow,jimbobhickville/taskflow,openstack/taskflow