* add nodeselector and tolerations for metallb
* remove unnecessary commented lines in metallb template
* set default speaker toleration to match original manifest
This changes MetalLB contrib to one of addons for deploying MetalLB with
Kubernetes cluster deployment. By the default, Kubespray doesn't deploy
MetalLB addon.
Maciej Wereski
François Hernandez
Arthur Outhenin-Chalandre
Kenichi Omichi