zsh_completion: Move helper function to autoload _hosts_or_user_at_host was used by 6 different completions, and previously was in all 6 of those files. I moved it out to its own file, _sd_hosts_or_user_at_host. This will be autoloaded for use in other completion functions. It also allows external completions to use this function by simply calling _sd_hosts_or_user_at_host as in the systemd completions.