1. Do not allow the same availability zone to be configured for both
NSX-V and NSX-T
2. Adding separate configurations for the nsx-v/t default availability
zones under the tvd configuration section:
[nsx_tvd]
nsx_v_default_availability_zones = zone2
nsx_v3_default_availability_zones = zone1
Change-Id: Ic77dae9398b8281b8ea4d2988447907d1ac55c90