kubelet reconcile: skip pod without status changes

[Hexilee]

close #775

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (1c50cfd) 36.76% compared to head (1400f71) 36.72%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #783      +/-   ##
==========================================
- Coverage   36.76%   36.72%   -0.05%     
==========================================
  Files          36       36              
  Lines        4346     4351       +5     
==========================================
  Hits         1598     1598              
- Misses       2600     2605       +5     
  Partials      148      148              

Files	Coverage Δ
pkg/controller/pod_driver.go	43.11% <0.00%> (ø)
pkg/controller/reconciler.go	0.00% <0.00%> (ø)

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