This change moves the image prep scripts out of a ser of variables and
into an actual template. This change will reduce our overall memory
footprint by simply rendering a template instead of injecting content
into a file using the copy module. The result will be faster time to
execution and more understandable output, especially when running in
debug.
Change-Id: Ic90fa7c8fdec8ffd844070ee78d30bd63a33a2a9
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>