Commits on Mar 5, 2021

1. Promote kubelet graceful node shutdown to beta …

   - Change the feature gate from alpha to beta and enable it by default
   
   - Update a few of the unit tests due to feature gate being enabled by
     default
   
   - Small refactor in `nodeshutdown_manager` which adds `featureEnabled`
     function (which checks that feature gate and that
     `kubeletConfig.ShutdownGracePeriod > 0`).
   
   - Use `featureEnabled()` to exit early from shutdown manager in the case
     that the feature is disabled
   
   - Update kubelet config defaulting to be explicit that
     `ShutdownGracePeriod` and `ShutdownGracePeriodCriticalPods` default to
     zero and update the godoc comments.
   
   - Update defaults and add featureGate tag in api config godoc.
   
   With this feature now in beta and the feature gate enabled by default,
   to enable graceful shutdown all that will be required is to configure
   `ShutdownGracePeriod` and `ShutdownGracePeriodCriticalPods` in the
   kubelet config. If not configured, they will be defaulted to zero, and
   graceful shutdown will effectively be disabled.

   

   bobbypage committed Mar 5, 2021
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