3e9e507a9b
Automatic merge from submit-queue kubeadm join: wait for API endpoints **What this PR does / why we need it**: enhance kubeadm to allow for parallel provisioning of API endpoints and slave nodes, continued from https://github.com/kubernetes/kubernetes/pull/33543 **Fixes**: https://github.com/kubernetes/kubernetes/issues/33542 **Special notes for your reviewer**: * Introduces a concurrent retry mechanism for bootstrapping with a single API endpoint during `kubeadm join` (this was left out in https://github.com/kubernetes/kubernetes/pull/33543 so that it can be implemented in a separate PR). The polling of the discovery service API itself is yet to come. @errordeveloper @pires