provision/coreos: start docker 1.12 correctly
provision/coreos: start docker 1.12 correctly

Signed-off-by: Peter Schultz <2e34c9842edc9a0b4d09adf340a14aa8c1f4c483@classmarkets.com>

voutilad/machine,voutilad/machine,dweomer/docker-machine,larsla/machine,SvenDowideit/machine,londoncalling/machine,SvenDowideit/machine,londoncalling/machine,dweomer/docker-machine,docker/machine,Herbis/machine,exoscale/docker-machine,exoscale/docker-machine,Herbis/machine,ibuildthecloud/machine,ibuildthecloud/machine,flavio/machine,larsla/machine,flavio/machine,dgageot/machine,docker/machine,dgageot/machine