A bunch of tweaks for working in a Toolbox container.

- Replace the bfg shell alias with a script, use the jar in the Docker
  image if available.
- Use full Docker image names for use with Podman.
- Remove kpcli and keybase aliases, not in use anymore.
- In the notify script, get the host' hostname if in a Toolbox
  container.
- Script to update the workbench container.