Fix Storyboard link to use openstack/heat
Fix Storyboard link to use openstack/heat

For sub-projects with no specific team to manage, we use directly
https://storyboard.openstack.org/#!/project/openstack/heat instead of
openstack/heat-cfnclient(Which migrated from Launchpad).

Change-Id: Ibbb1d0e3eaef75f0a29998132a252960ba5f1333

openstack-dev/heat-cfnclient