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Automatic merge from submit-queue Supports 'ensure exist' class addon in Addon-manager Fixes #39561, fixes #37047 and fixes #36411. Depends on #40057. This PR splits cluster addons into two categories: - Reconcile: Addons that need to be reconciled (`kube-dns` for instance). - EnsureExists: Addons that need to be exist but changeable (`default-storage-class`). The behavior for the 'EnsureExists' class addon would be: - Create it if not exist. - Users could do any modification they want, addon-manager will not reconcile it. - If it is deleted, addon-manager will recreate it with the given template. - It will not be updated/clobbered during upgrade. As Brian pointed out in [#37048/comment](https://github.com/kubernetes/kubernetes/issues/37048#issuecomment-272510835), this may not be the best solution for addon-manager. Though #39561 needs to be fixed in 1.6 and we might not have enough bandwidth to do a big surgery. @mikedanese @thockin cc @kubernetes/sig-cluster-lifecycle-misc --- Tasks for this PR: - [x] Supports 'ensure exist' class addon and switch to use new labels in addon-manager. - [x] Updates READMEs regarding the new behavior of addon-manager. - [x] Updated `test/e2e/addon_update.go` to match the new behavior. - [x] Go through all current addons and apply the new labels on them regarding what they need. - [x] Bump addon-manager and update its template files.