DCOS: implement upgrade operation for clusters with bootstrap node

[dmitsh]

implement upgrade operation for clusters with bootstrap node

[codecov]

Codecov Report

Merging #3030 into master will decrease coverage by 0.78%.
The diff coverage is 32.16%.

@@            Coverage Diff            @@
##           master   #3030      +/-   ##
=========================================
- Coverage   51.59%   50.8%   -0.79%     
=========================================
  Files          97      99       +2     
  Lines       14834   14980     +146     
=========================================
- Hits         7654    7611      -43     
- Misses       6482    6672     +190     
+ Partials      698     697       -1

Impacted Files	Coverage Δ
cmd/scale.go	0% <0%> (-12.93%)	⬇️
cmd/root.go	25.39% <0%> (+10.88%)	⬆️
pkg/operations/remote_ssh.go	0% <0%> (ø)
cmd/dcos-upgrade.go	32.5% <32.5%> (ø)
pkg/api/orchestrators.go	68.26% <57.14%> (+0.01%)	⬆️
cmd/orchestrators.go	31.81% <0%> (-45.46%)	⬇️
cmd/deploy.go	24.46% <0%> (-18.02%)	⬇️
cmd/generate.go	32.38% <0%> (-15.24%)	⬇️
pkg/operations/kubernetesupgrade/upgrader.go	57.56% <0%> (-0.47%)	⬇️
... and 7 more

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[jackfrancis]

Running upgrade sanity check, will merge after

[jackfrancis]

/approve
/lgtm

[acs-bot]

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