migrate from apps/v1beta1 to apps/v1

[qw1mb0]

Kubernetes 1.16 removed old versions of API: kubernetes/kubernetes#70672

This PR migrates from apps/v1beta1 to apps/v1 (apps/v1 is available from version kubernetes 1.9) and add livenessProbe for guard

[codecov-io]

Codecov Report

Merging #225 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #225   +/-   ##
=======================================
  Coverage   34.43%   34.43%           
=======================================
  Files          26       26           
  Lines        1397     1397           
=======================================
  Hits          481      481           
  Misses        883      883           
  Partials       33       33

Impacted Files	Coverage Δ
auth/providers/azure/options.go	13.63% <0%> (ø)	⬆️
server/serving.go	4.22% <0%> (ø)	⬆️
auth/providers/token/options.go	11.36% <0%> (ø)	⬆️
auth/providers/gitlab/options.go	0% <0%> (ø)	⬆️
auth/providers/google/options.go	12.06% <0%> (ø)	⬆️
auth/providers/github/options.go	0% <0%> (ø)	⬆️
auth/providers/providers.go	30% <0%> (ø)	⬆️
auth/providers/ldap/options.go	23.59% <0%> (ø)	⬆️

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[tamalsaha]

Thanks @qw1mb0 !