`docker version` subcommand is able to return both docker client and
docker daemon information.  To get a daemon version, it connects to a
possibly remote daemon.  If the remote daemon is not accessible, the
client waits for some time, until it gets interrupted by timeout.

As a result we can have a docker client running in background. When zsh
session is rather short, a terminal application (iTerm2) starts asking
if that background docker process should be stopped.

On the other hand, to get a docker client version only, we can use
`docker --version` instead. It does not connect to a daemon.

Closes #11780