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missing \ was causing command not found errors when tab completing docker build -t <tab>

Closes #5683

Closes #5568

Source:
https://github.com/docker/docker/commit/c9fdf9abf8d6443598808809b900d96e04adfcb1

https://github.com/docker/docker/blob/be9e3f59e625a7be05f21a23f6debfb3f6728573/contrib/completion/zsh/_docker

See https://github.com/docker/docker/blob/master/contrib/completion/zsh/_docker

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

completion script

Remove the docker insert command of autocomplete

Fixing some issues where show repeated weird values, and fixed commands that need the container autocomplete without being running, like start, now it autocompletes showing all the containers so you can start without knowing the right name

docker container autocomplete listing uses containers ID instead of names.
Most users identify their containers by name. ID is only needed and used on a dynamic environment more suited in scripts.

This is exactly what happens on tab completion for docker rmi. This commit
fixes that.

```sh
$ docker rmi <hit TAB>
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
```

Many deprecations since 0.8 and new commands.