#4322: Fix render not fully overwriting output files.

[alewis001]

If the output file already existed, it was not being truncated to the
new output. If the existing content was larger than the new output, the
remainder of the existing output was left in the file corrupting the
contents.

Fixes: #4322

Description

The changes are:

• Change the os.OpenFile call to os.Create in util.go
• Change kustomise.go to be consistent with the other deployers and use the outputRenderedManifests function of util.go

[codecov]

Codecov Report

Merging #4323 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4323      +/-   ##
==========================================
+ Coverage   71.76%   71.81%   +0.05%     
==========================================
  Files         324      324              
  Lines       12477    12468       -9     
==========================================
  Hits         8954     8954              
+ Misses       2954     2947       -7     
+ Partials      569      567       -2     

Impacted Files	Coverage Δ
pkg/skaffold/deploy/kustomize.go	77.57% <100.00%> (+2.86%)	⬆️
pkg/skaffold/deploy/util.go	63.88% <100.00%> (ø)
...affold/kubernetes/portforward/kubectl_forwarder.go	63.41% <0.00%> (+2.43%)	⬆️

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[briandealwis]

Good catch! Could you please fix up the situation identified below?