Apply timeout to kubeclient and remove KubeTimeout

[s4nji]

This PR:

• Removes all uses of KubeTimeout
• Sets a default 5 seconds timeout to controller and proxy kubeClient
  • Adds KUBE_CLIENT_TIMEOUT environment variable to configure this
• Adds 60 seconds timeout to controller syncHandler
  • This is configurable via SYNC_HANDLER_TIMEOUT environment variable
• Sets a default 60 seconds timeout to kubeClients in integration tests
• Retains 30 seconds timeout (from KubeTimeout) when waiting for kube resources to appear

[codecov]

Codecov Report

Merging #106 (4c4c873) into master (ee23549) will decrease coverage by 0.33%.
The diff coverage is 48.64%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
- Coverage   57.42%   57.09%   -0.34%     
==========================================
  Files          35       35              
  Lines        2504     2487      -17     
==========================================
- Hits         1438     1420      -18     
- Misses        952      953       +1     
  Partials      114      114              

Impacted Files	Coverage Δ
cmd/api.go	0.00% <0.00%> (ø)
cmd/controller.go	18.75% <0.00%> (ø)
cmd/proxy.go	0.00% <0.00%> (ø)
pkg/controller/loadtest.go	3.58% <0.00%> (ø)
pkg/kubernetes/client.go	89.36% <0.00%> (-5.03%)	⬇️
pkg/proxy/service.go	68.75% <ø> (-1.13%)	⬇️
pkg/controller/test_helper.go	54.00% <63.63%> (-0.13%)	⬇️
pkg/proxy/proxy.go	82.24% <91.66%> (-0.71%)	⬇️

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[boekkooi-fresh]

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