golint: 99%
	pkg/minikube/localpath/localpath.go
		Line 64: warning: comment on exported function SanitizeCacheDir should be of the form "SanitizeCacheDir ..." (golint)
gocyclo: 99%
	pkg/minikube/cluster/cluster.go
		Line 422: warning: cyclomatic complexity 16 of function createHost() is high (> 15) (gocyclo)
	cmd/minikube/cmd/start.go
		Line 276: warning: cyclomatic complexity 18 of function runStart() is high (> 15) (gocyclo)
		Line 742: warning: cyclomatic complexity 18 of function validateFlags() is high (> 15) (gocyclo)

Use ListDrivers() method to get the list of VM drivers.
SupportedVMDrivers become the whole list of VM drivers on all
platforms, which is used in gendocs only.

Fixed mount daemon to be off by default and to use different directories than the current mounts until they are turned off.

A manual change was required in kube2sky.go.
Updates were required in appc/spec and a few other libraries.

This commit adds a root CLI with no commands yet. This was generated
using "cobra init", with only a few modifications:

- License fixes.
- Removal of viper config loading.
- Help text modifications.