Use serializable health checks for etcd probes

[brandond]

Proposed Changes

Use serializable health checks for etcd probes

Refs:

• kubeadm: add serializable health checks for etcd probes kubernetes/kubernetes#110072
• Enhance health check endpoint to support serializable request etcd-io/etcd#13399

Types of Changes

bugfix

Verification

Check etcd static pod manifest

Linked Issues

• Use serializable health checks for etcd probes #3076

Further Comments

[codecov-commenter]

Codecov Report

Merging #3073 (6390b75) into master (8aa5295) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master   #3073   +/-   ##
======================================
  Coverage    4.96%   4.96%           
======================================
  Files          25      25           
  Lines        2053    2053           
======================================
  Hits          102     102           
  Misses       1925    1925           
  Partials       26      26           

Flag	Coverage Δ
unittests	4.96% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/podexecutor/staticpod.go	0.00% <0.00%> (ø)

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