Use also distro_version inside extra_bootstrap_packages
Sometimes same distro has different packages in different versions. Like ubuntu:
- ubuntu xenial: libavcodec-ffmpeg56 libopenjpeg-dev
- ubuntu bionic: libavcodec57 libopenjp2-7-dev
Searching for distro and also for distro_version adds an extra feature into extra_bootstrap_packages.
Edited by Rubén Gonzalez