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Automatic merge from submit-queue (batch tested with PRs 38101, 41431, 39606, 41569, 41509) kubeadm: Reorder the token packages more logically **What this PR does / why we need it**: In order to be able to implement https://github.com/kubernetes/kubernetes/pull/41417, the token functionality (which now is spread across the codebase), should be in two places: a generic token functions library, which in the future _may_ [move into client-go](https://github.com/kubernetes/kubernetes/pull/41281#discussion_r101357106) in some form, and a package for the token handling against the api server. This commit has no large functional changes. ``` kubeadm: Aggregate the token functionality in sane packages. - Factor out token constants to kubeadmconstants. - Move cmd/kubeadm/app/util/{,token/}tokens.go - Use the token-id, token-secret, etc constants provided by the bootstrapapi package - Move cmd/kubeadm/app/master/tokens.go to cmd/kubeadm/app/phases/token/csv.go This refactor basically makes it possible to hook up kubeadm to the BootstrapSigner controller later on ``` **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # **Special notes for your reviewer**: **Release note**: ```release-note NONE ``` @mikedanese @pires @errordeveloper @dmmcquay @jbeda @GheRivero