PBB PIP pre-provisioning update - 3

Added hierarchical dependency checks for virtual instance port ( #VIP ) on create routines in bridge module. Modified activation routines of VIP-to-PIP mapping, for passing on state changes to VIP port handlers to act accordingly. This also consolidates the provider instance port ( #PIP ) related operations in VIP handlers.

#802-1AH update 18 ...
[commit 714dd56fd8c7abf0d34dff11797ffcf90964dc98]