Git script to remove temp work tress and prune work trees.

So there's a different default private key and also separate the public
keys I use to encrypt for other people in Endless.

Use the variable file matching the workspace when validating. Also when
validating and formatting, show the diff.

The prune_ssh_sockets shell function would always delete the
ControlMaster sockets (the open file handlers would have a random suffix
and the check would always show that the socket wasn't open by any
process). Instead add a prefix to the ControlMaster sockets and ignore
them when pruning. Those sockets are always deleted when the process
exists. Also, mark the vim filetype for the ssh config fragments as
sshconfig.

Use the openvpn endpoint as a jump host, it eases the firewall
restrictions. Clean up duplications.

They have hashes but aren't secrets.

Don't delete sockets that are still in use (have an open ssh client
listening).

So now I can run `$(eval docker remote hostname)`.

- Add toolbox script, bash completion.
- Better ansible-local in Makefile (match shell alias).
- Delete gcloud SDK bash completion, the mirror in github is gone.
- Update to newer version of binaries and vendored files.

Per
https://docs.ansible.com/ansible/latest/reference_appendices/config.html#the-configuration-file
the ~/.ansible.cfg file is ignored if another is found first. So use
environment variables instead so they work with all of my setups (the
internded purpose). Also, for the ansible-local and
ansible-local-playbook aliases, use the Python3 interpreter that was
used to run Ansible in the first so that modules (like postgresql_privs)
that require Python module have access to them.

- Rename them to tf* instead of t* (tr is already taken, so avoid that).
- Don't use a variable file for the workspace if not variable file
exists.

In some cases (like a chroots or containers with minimal /dev)
/dev/stderr is not available. Replace outputting to fd 2 instead.

git grep -l '>> /dev/stderr' | xargs sed -i 's@>> /dev/stderr@>\&2@g'

The checks for open ports/ sockets was timinig out after 1 second which
isn't reasonable.

Otherwise the files (as root) are written to my home directory and when
I correct the ownership I get this error: "Refusing to operate on a user
installation as root".

- Add missing symlink to the wrapper script, without it the scripts
can't be called as Vagrant commands.
- Fix pylint issues.

Too many changes in one commit that aren't relevant to each other all
because I didn't commit these for some time and they piled up, exactly
what I shouldn't do.

- Remove some Git submodules. They're not needed.
- Remove the REPREPRO_BASE_DIR environment variable, it's set with
direnv inside that project.
- Use Docker Buildkit.
- Use auto Python interpeter with Ansible, prefer Python3.
- Better ls aliases.
- Netcat aliases to listen and check ports and sockets.
- Aliases and functions for Terraform.
- Use Black to format Python code.
- Show the run duration and exit code in a line before the prompt, maybe
better with Bash earlier than 5.0, where there's an annoying with line
wrapping.
- Valid name for the flatpak_kill shell function.
- Delete user-dirs files, didn't do anything anyway.
- Convert README from reStructuredText to Markdown.
- Don't install gsutil with Python2, use snap to install the Google SDK.
- More pre-commit hooks, update the exiting ones, format the file for
yamllint, Use flake8 from it's repo, the one from the hooks repo is
deprecated.
- Clean the Shore SSH config.
- Add the shared AWS keys to the Endless SSH config.