The functionality to bootstrap node certificates is ready but is blocked
by a seperable issue discussed in:
https://github.com/kubernetes/community/pull/1982. The functionality
could be useful for power users who want to write their own approvers if
the feature could be promoted to beta. In it's current state this
feature doesn't help anybody.

I propose that we remove automated approval of node serving certificates
for now and work towards getting the node functionality to beta.