Properly get/compute the `sudo` value on create.
Avoid getting the `DeprecationWarning`.
The deploy command should always be called with `sh` not `bash`, and even for the `root` user.

* We should not use `bash` because not all distro's on EC2 have `bash` installed.
Merge pull request #484 from s0undt3ch/develop

Several fixes for the EC2 driver