Temporarily stop using this provider as its causing various problems,
the load on CI has been reduced to allow R2 to be able to handle it
solo. Once we redeploy and gain some confidence in this region we
will be adding it back in. Setting max-servers to 0 will allow nodepool
to gracefully cleanup nodes.
Change-Id: Ib16dbef47b74bb027d47c60b50448d51c0110ca3