Move choosing of pool port from kuryr-controller to kuryr-daemon

In the crusade to decrease control plane latency and improve controller downtime behavior, a proposal was made to have:

* A VIF handler in kuryr-controller that only does pool management (e.g creation and deletion of ports in pools) and then updates pool information to the cni daemons. Communication may consist of:
  * Annotating a node.
  * Creating a CRD (Custom Resource Definition) object for each Pool.
  * Creating a CRD object for each port in the Pool.
* a CNI daemon nested VIF driver that loads the existing VIF pool and when requests come just selects VIFs and annotates the pod with the VIF selection (or marks it somehow).