Improve seperation of cmd and pkg for host folder actions

[hferentschik]

pkg/minishift/hostfolder/cifs_hostfolder.go still does a lot of writing to the console, like fmt.Println("OK") or fmt.Println("FAIL"). This should really happen in the cmd part of the source tree.

One can try to further separate it or if not possible to cleanly separate a Writer should be passed along, and the messages should be written to the writer. This allows to discard messages or write to stdout, etc

[gbraad]

pkg should ideally return bool, error states. Rather do not see a Writer being used... unless we have several messages to capture. But likely bubbling an error up would be sufficient enough.

[stale]

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