BBS SDNC DGs need logic to delete resource from AAI

GENERIC-RESOURCE-API_bbs-internet-profile-network-topology-operation-delete-huawei
GENERIC-RESOURCE-API_bbs-access-connectivity-network-topology-operation-delete-huawei

need to also include the logic to delete the resource instance from AAI

'create' flows currently include:
1) store service metadata in AAI
2) store generic-vnf in AAI
3) create relationship between resource-service instance in AAI

'delete' flows should also include:
1) delete generic-vnf in AAI