Since MetalLB v0.8[1], metallb:speaker has started publishing an event
nodeAssigned on k8s resource.
To support MetalLB v0.8+, this allows metallb:speaker to create events.

[1]: https://github.com/metallb/metallb/commit/5cc6e237766d742fccde1a8a325baba2608024df#diff-60053ad6fecb5a3cfabb6f3d9e720899R246