Add -p flag for cp & Fix usergroup permission
Add -p flag for cp & Fix usergroup permission

cp '-p' flag is preserve the specified attributes
'chown' and 'chmod' is no longer required in the install jobs

OS X default root group is not 'admin', Correctly 'wheel'

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

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