Allow managing raw `MachineSets` #158

Job	Run time
editorconfig	7s
golden (defaults)	18s
golden (gcp)	18s
linting (lint_jsonnet)	6s
test (defaults)	17s
golden (maxpods)	20s
linting (lint_yaml)	8s
test (gcp)	19s
golden (pidslimit)	16s
linting (lint_adoc)	6s
golden (machineconfig)	20s
test (maxpods)	19s
golden (remove-machineconfigpool)	20s
test (pidslimit)	16s
test (machineconfig)	16s
test (remove-machineconfigpool)	18s
	4m 4s

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