Fix UUID helper func - Reducing uselessness point on uuidgen func - Fix uuid2mac to execute under the sudo
Fix UUID helper func
- Reducing uselessness point on uuidgen func
- Fix uuid2mac to execute under the sudo

Signed-off-by: Koichi Shiraishi <2e5bdfebde234ed3509bcfc18121c70b6631e207@gmail.com>

zchee/docker-machine-driver-xhyve,zchee/docker-machine-driver-xhyve