Consider replacing some of dockerutils functionality with docker-machine

[rappdw]

create-dock
destroy-dock
start-dock
stop-dock
ls-dock
ssh-dock

are essentially duplicates of functionality in docker-machine.

Plus docker-machine has much more extensive support for other cloud providers and provisioning.

An additional advantage is that much of the cert, daemon configuration could be removed from our base AMI and just have the AMI focused around the aspects of the use case