Fix npm job
Fix npm job

horizon is doing frequent releases, the install from source is not
working as is anymore. Remove it.

Change-Id: I78b4c6bd2f0ac7bdf39f69d1be4ecd32ce953d52

openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,openstack/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard,stackforge/senlin-dashboard