Upgrade kube dependencies to v1.19

[travisgroth]

Summary

Upgrade to kubernetes 1.19 and related packages. This needed to be done eventually anyway, but for the full set of ingress path specification fields, we need to be on 1.19.

The upgrade did introduce some new method signatures and restrictions that had to be accounted for.

• Upgrade deps
• Switch stop channel to context/cancel
• Stop re-using the same builder for multiple controllers
• Implement ClientBuilder interface
• Switch to client.Object

Related issues

#101

Checklist:

• add related issues
• ready for review

[codecov]

Codecov Report

Merging #113 (a4d7961) into master (0385952) will increase coverage by 0.98%.
The diff coverage is 77.77%.

❗ Current head a4d7961 differs from pull request most recent head de94217. Consider uploading reports for the commit de94217 to get more accurate results

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   72.63%   73.61%   +0.98%     
==========================================
  Files           7        7              
  Lines         402      398       -4     
==========================================
+ Hits          292      293       +1     
+ Misses         79       76       -3     
+ Partials       31       29       -2     

Impacted Files	Coverage Δ
cmd/pomerium-operator/root.go	55.35% <0.00%> (ø)
internal/controller/policy.go	81.33% <ø> (ø)
internal/operator/operator.go	66.66% <80.00%> (+3.87%)	⬆️
internal/configmanager/configmanager.go	85.71% <100.00%> (+2.38%)	⬆️
internal/controller/reconciler.go	79.62% <100.00%> (ø)

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[wasaga]

I'm not sure if the expectation that if you immediately cancel it would already be able to store settings?

[travisgroth]

It does read a little funny, but the underlying loop will persist the config before actually terminating from cancel().