[Bug 3124] New: Add a token to expand to remote hostname without domain name

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3124

            Bug ID: 3124
           Summary: Add a token to expand to remote hostname without
                    domain name
           Product: Portable OpenSSH
           Version: 8.2p1
          Hardware: amd64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: mmoya at mmoya.org

Add a token (say %H) for expanding the remote hostname *without* the
domain name.

This feature will be useful to make config more clear when setting up
access through a bastion host.

Right now, getting the remote hostname (without domain name) can be
achieved with a shell hack.

Example config:

```
Host *.proj
  ConnectTimeout 5
  IdentityFile ~/.ssh/id_ecdsa-proj

Host *.prod.proj
  ProxyCommand ssh 1.2.3.4 -W $(echo %h | cut -d. -f1):%p

Host *.staging.proj
  ProxyCommand ssh 2.3.4.5 -W $(echo %h | cut -d. -f1):%p
```

compare that to something like:

```
Host *.proj
  Hostname %H  # a hypothetical new token expanding to the host part of
the remote hostname
  ConnectTimeout 5
  IdentityFile ~/.ssh/id_ecdsa-proj

Host *.prod.proj
  ProxyJump 1.2.3.4

Host *.staging.proj
  ProxyJump 2.3.4.5
```

Thanks

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