This patch updates the v2 API reference according to the current implementation. The main update APIs are as follows: * Show VNF instance * List VNF instance * Change Current VNF Package * Show VNF LCM operation occurrence * List VNF LCM operation occurrence * Fail a VNF LCM operation occurrence * Create a new subscription * Show subscription * List subscription Change-Id: Idca22a874b746c02e9d97f4ca08a1cfcee76ccc3