WIP: Add SysV init support

[tstromberg]

My slightly crazy attempt to support SysV init systems like Upstart and OpenRC.

I only did this because I wanted to try minikube on Cloud Run.

[k8s-ci-robot]

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[medyagh]

thanks for doing it :) you are a hero

[afbjorklund]

Are those systems also missing the standard service wrapper ?

[codecov-io]

Codecov Report

Merging #7081 into master will increase coverage by 0.12%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master    #7081      +/-   ##
==========================================
+ Coverage   36.68%   36.80%   +0.12%     
==========================================
  Files         146      145       -1     
  Lines        8980     8957      -23     
==========================================
+ Hits         3294     3297       +3     
+ Misses       5294     5274      -20     
+ Partials      392      386       -6     

Impacted Files	Coverage Δ
cmd/minikube/cmd/docker-env.go	49.47% <0.00%> (+1.02%)	⬆️
cmd/minikube/cmd/status.go	21.18% <0.00%> (+0.69%)	⬆️
pkg/minikube/bootstrapper/bootstrapper.go	0.00% <ø> (ø)
pkg/minikube/bootstrapper/bsutil/binaries.go	5.00% <0.00%> (-0.13%)	⬇️
pkg/minikube/cluster/pause.go	0.00% <0.00%> (ø)
pkg/minikube/cruntime/docker.go	28.16% <75.00%> (-0.49%)	⬇️
pkg/minikube/cruntime/containerd.go	43.26% <100.00%> (-0.49%)	⬇️
pkg/minikube/cruntime/crio.go	52.12% <100.00%> (+1.12%)	⬆️
pkg/minikube/cruntime/cruntime.go	67.92% <100.00%> (+10.42%)	⬆️

[tstromberg]

Obsolete.