Remove extra resource definition loading
Remove extra resource definition loading

With the current resource list implementation, we end up recreating
resource definitions for every single resource, as we cache the
template, but not the definitions. Caching that instead improves
resource listing by a good chunk.

Change-Id: Ic3b252cd9c2d61abbe2b247375e5e917562a4952

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat