1. What is the problem
1) Tricircle does not enable router's az
2) Tricircle's network topology is too complex for local
router(router reside only in one region)
2. What is the solution to the problem
1) Enable router's az
2) Remove ns-router and bridge network when used local router
3. What the features need to be implemented to the Tricircle
1)Enable router's az
2)Attach external network to local router directly, no additional
intermediate router is needed.
Implements: blueprint enable-router-az-simplify-net-top
Change-Id: I410a81c9d0e56db8163e611211b8dbd4c5772767
da443110e9