Fix gate job for test_vnf_param_with_artifacts_image_tosca_template
Fix gate job for test_vnf_param_with_artifacts_image_tosca_template

In functional test test_vnf_param_with_artifacts_image_tosca_template, heat create
task to fetch GlanceWebImage from param url value, and stuck in infinite loop of running
and sleeping task, due to which vnf creation could not be completed and VNF failed with
PENDING_CREATE. This issue occured due to bug #1847188, skipping test until bug fixed.

Change-Id: Ifeb3d46b8b78688687f53e2f17fecddef1ed4b3b

openstack/tacker,openstack/tacker,stackforge/tacker,stackforge/tacker,openstack/tacker