taskrunner: Remove debug print
taskrunner: Hardcode treecompose definition

It's annoying to have to write it to a file.
config: Drop default outputdir

You have to edit it.
py: Drop command checking

We need this now that these are individual commands, and
our RPM package actually has real dependencies.

The motivation here really is to trim duplicated code.
py: Introduce taskbase

This fixes the code duplication that was introduced when I split them
into separate files.
imagefactory: Substitute more variables in kickstart

This way I can share the kickstarts more between distributions.