In order to improve the performance of Tacker in commercial systems,
This patch provides the following code refactoring to improve system
performance.
1. Reduce transaction of getting OpenStack resource from Heat
(for Tacker v2 API)
2. Support subscription filter of vnfdId (for Tacker v1 API)
3. Refactor the Tacker Output Logs (for Tacker v1/v2 API)
Implement: blueprint system-performance-management
Change-Id: I8879a690e455fb196c2e28a251bf46cea7376b56
0c69e122b2