Adding imagePullPolicy

[bloodbare]

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[codecov-io]

Codecov Report

Merging #4 into master will decrease coverage by 0.03%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   70.77%   70.74%   -0.04%     
==========================================
  Files          31       31              
  Lines        1297     1299       +2     
==========================================
+ Hits          918      919       +1     
- Misses        379      380       +1

Impacted Files	Coverage Δ
aioclustermanager/k8s/job.py	68.33% <50%> (-0.64%)	⬇️

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