container script: Various improvements
- Install bash-completion when provisioning container, makes terminal usage more comfortable.
- Increase default container image size to 16G, so that a distribution upgrade fits well.
- Check free disk space on host before expanding disk image.
- Make pytest coverage reports writable to the fbx user, closes #2010 (closed).
- run-tests command:
- Use DEBIAN_FRONTEND=noninteractive when upgrading packages.
- Do not install sshpass as provision script already installs it.
Signed-off-by: Veiko Aasa veiko17@disroot.org