Description of problem:
Nuage has many event types (thousands) e.g. "subnet_create", "subnet_delete" etc. Problem is that event type currently contains no nuage-specific substring which could cause problems when displaying event timelines, which are not per-provider.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Add Nuage privder with eventing enabled
2. Observe event types generated
Event types are like: