Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Updates kubeadm default to use 1.10 **What this PR does / why we need it**: In line with https://github.com/kubernetes/kubeadm/blob/master/docs/release-cycle.md, the default branch for kubeadm to deploy should be bumped right before the rc.1. This can even be manually merged by the someone from the release team. **Which issue(s) this PR fixes** : Fixes #60608 **Special notes for your reviewer**: **Release note**: ``` Updates default deployment for kubeadm to 1.10 ``` /cc @kubernetes/sig-cluster-lifecycle-pr-reviews @kubernetes/sig-release-members @dims @jberkus @jdumars