Rather than getting a set of base packages from the ImageType, and then
appending the requested packages from the blueprint, pass the blueprint
into the new Packages() function, and return the full set of packages to
be depsolved.
This allows us to also append packages based on other customizations
too, and use that to append chrony when the timezone is set. This
matches the behavior anaconda had, and there was a TODO item to do this,
which had been overlooked.
Fixes#787.
Signed-off-by: Tom Gundersen <teg@jklm.no>
50d469fe45