Mock the HTTP action in the with_items tests
Mock the HTTP action in the with_items tests

At the moment it attempts to access http://www.example.com. This causes
a DNS lookup which will fail in some build environments.

Change-Id: Ia89db5382eacacead8e2f937ebee5af4b68ca218

StackStorm/mistral,openstack/mistral,openstack/mistral,StackStorm/mistral