Changes

2nd part of vnflcm api
   - VNF LCM operation occurrences
  - Individual VNF LCM operation occurrence
  - Retry operation task
  - Rollback operation task
  - Fail operation task
  - Cancel operation task
  - Subscriptions
  - Individual subscription
  - Notification endpoint
Change-Id: I7a104afcfa44b4103787e72ef85feff0393d5290 Signed-off-by:
Gergely Csatari <gergely.csatari@nokia.com>