So `_docker-dev` could be invoked as `docker dev` without `docker-dev`
getting in the way of tab completion. Renamed the current subcommands
accordingly.

- Vendored rabbitmqadmin, Bash completion.
- Use gsutil from PyPI, vendored Bash completion.
- Use gcloud from Snap, remove Docker aliases (it just for Linux
anyway).
- on-change, cw, mysqldump-loader Golang apps.
- importlab, remarshal Python apps.

- Move global config to appear last (first setting that matches wins,
thus global should be last, matches anything that's not explicit).
- Added specific braavos@endless config.

- `exec` docker wrapper scripts.
- Added aws-sam-cli Python CLI, readded aws-shell Python CLI.

- Added Makefile to download the vendored and binary files.
- Replace gen-ssh-config with the said Makefile.
- Update all sorts of Bash completion files.
- Added `kompose` Bash completion file.
- Replace pythonrc submodule with said Makefile.
- Replace `bfg` shell function with said Makefile (and short shell
alias).
- Update Git hook to use Makefile, remove whatever was removed.
- Added `rc_update` shell alias to force update all said files.
- Added `kind` Golang binary.