Can't use sshlogin host with underscore in name

[Christopher Fredén]

Hello,

When I run `parallel -S hello_you.com echo {} ::: hej` for example.

I get the following output:

```
parallel: This should not happen. You have found a bug. Please follow
https://www.gnu.org/software/parallel/man.html#REPORTING-BUGS

Include this in the report:
* The version number: 20220322
* The bugid: SSHLogin parser failed on 'hello_you.com' => '_you.com'
* The command line being run
* The files being read (put the files on a webserver if they are big)

If you get the error on smaller/fewer files, please include those instead.
```

When I run the same command with a hostname without underscore it works just
fine.

I couldn't find anyone reporting this error online, I'm I doing something wrong
or is this a bug?

Best regards,
Christopher

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