Feat/add dns policy

[notjames]

Signed-off-by: Jim Conner [email protected]

What this PR does / why we need it:
When using celium CNI in AWS with webhooks, containers require that hostNet is set to true and dnsPolicy is set so ClusterFirstWithHostNet or else webhooks will fail.

Special notes for your reviewer:

[sozercan]

@notjames Can you update https://github.com/open-policy-agent/gatekeeper/blob/master/cmd/build/helmify/static/README.md and this should be good to merge. Thank you!

[notjames]

@notjames Can you update https://github.com/open-policy-agent/gatekeeper/blob/master/cmd/build/helmify/static/README.md and this should be good to merge. Thank you!

I'll do it right now. I wasn't sure if this was automated or not.

[notjames]

@notjames Can you update https://github.com/open-policy-agent/gatekeeper/blob/master/cmd/build/helmify/static/README.md and this should be good to merge. Thank you!

I'll do it right now. I wasn't sure if this was automated or not.

all done. Thank you! I am assuming that the Chart.yaml version is bumped by CI?

[codecov-commenter]

Codecov Report

Merging #1624 (cd71248) into master (7526893) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1624      +/-   ##
==========================================
+ Coverage   54.30%   54.40%   +0.09%     
==========================================
  Files          94       94              
  Lines        8178     8178              
==========================================
+ Hits         4441     4449       +8     
+ Misses       3388     3382       -6     
+ Partials      349      347       -2     

Flag	Coverage Δ
unittests	54.40% <ø> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
pkg/controller/config/config_controller.go	65.04% <0.00%> (-1.33%)	⬇️
...onstrainttemplate/constrainttemplate_controller.go	59.90% <0.00%> (+1.67%)	⬆️
pkg/watch/replay.go	81.25% <0.00%> (+2.27%)	⬆️

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[maxsmythe]

LGTM

[sathieu]

This PR broke gatekeeper installation in my setup.

As said in doc:

Note: "Default" is not the default DNS policy. If dnsPolicy is not explicitly specified, then "ClusterFirst" is used.

I will create a PR to use ClusterFirst as default.

EDIT: Done by #1676.