If all you want is to test an image or product and to achieve this
you need to generate several images a day, you will end up with
lots of AMI's and snapshots that have no use in the end of the day.
This commit adds the new boolean manifest option "deregister_ami"
that, if True, deletes the recently created AMI and snapshot. So, the
final result will be only the running instance, nothing else.
It adds the ability to automatically launch an EC2 instance
after AMI registration.
It has no mandatory configuration, only optional ones, like
instance type, security groups, etc. They should be documented in
later documentation patches.
