Needs little update for newer TF version

[kennethgp]

Hi, I had to take out resource_group_name from lb-related resources. Also changed in lb rule:

backend_address_pool_id = azurerm_lb_backend_address_pool.lb.id

to

backend_address_pool_ids = [azurerm_lb_backend_address_pool.lb.id]

Other interesting thing is that forwarding worked right after the apply, I didn't have to run the routing script on hub machine 👍