Spits out "machine: '<command>' is not a machine command see 'machine
--help'" to be inline with Docker
Signed-off-by: Simon Thulbourn <simon+github@thulbourn.com>
As per #77, this PR adds --storage-path/MACHINE_STORAGE_PATH (env var)
to allow the user to specify where they want to store the machine db
Signed-off-by: Simon Thulbourn <simon+github@thulbourn.com>