turn off root password auth for EC2 images
turn off root password auth for EC2 images

Note that the Augeas "set" call exposed in libguestfs doesn't actually
return anything on success and throws an exception on failure.

redhat-imaging/imagefactory,jmcabandara/imagefactory,LalatenduMohanty/imagefactory,henrysher/imagefactory,redhat-imaging/imagefactory,jmcabandara/imagefactory,henrysher/imagefactory,LalatenduMohanty/imagefactory