The functions are sourcing other files that define global variables,
so they will spill into the callers shell unnecessarily. We will also
add some functionality that uses traps in follow-up commits, so it's
good to limit the scope of traps too.
ci-automation builds on the SDK container and simplifies CI automation
build tasks (SDK bootstrap, SDK container, packages, image, VMs).
See ci-automation/README.md for a brief introduction.
Signed-off-by: Thilo Fromm <thilo@kinvolk.io>
