Fix brg-topo DGs

1. Added get vg-mgmt-ip in brg-topo-activate
so that vg tunnel could be properple setup

2. Added get vbrg-wan-ip to brg-topo-deactivate
so that vxlan tunnels can be removed

3. Updated AA&I updates calls to include
correct brg variables for global-customer-id,
service-type and service-instance-id

Issue-Id: SDNC-195
Change-Id: I9470cd782a3bd00fa9332dd7141c28151054b75f
Signed-off-by: Marcus G K Williams <marcus.williams@intel.com>
Former-commit-id: becd9978df3428354646a48c2d106177f6477695