implement --node-annotation

[iameli]

Is your feature request related to a problem? Please describe.
TLDR: k3s has --node-label=k=v already, it would be nice to have --node-annotation=k=v also.

My use case is actually still in the Rancher ecosystem; I'm setting up Longhorn and I'd like the nodes to be able to specify which disks they have. I need to add a label of

node.longhorn.io/create-default-disk: 'config'

And an annotation with a value of

node.longhorn.io/default-disks-config: '[{"path":"/mnt/HDD1","allowScheduling":true},{"path":"/mnt/HDD2","allowScheduling":true}]'

I can do the label with --node-label=node.longhorn.io/create-default-disk=config but there's no --node-annotation.

Describe the solution you'd like

--node-annotation=key=value

Describe alternatives you've considered

Presently I'm applying the annotations out-of-band in our provisioning process but it would be great to not need to do that.

[brandond]

This has been requested and denied upstream: kubernetes/kubernetes#60832

[iameli]

Fair enough.