Comment 0 for bug 1771340

After adding some lines to /etc/ssh/sshd_config I tried to reload the configuration with the command:

```
sudo systemctl reload sshd
```

No error message was returned. So I assumed that the sshd was running with the current config. But `sudo systemctl status sshd` told me that the service failed due to a wrong option in /etc/ssh/sshd_config. Please see the following output:

~~~
:~$ sudo vim /etc/ssh/sshd_config
:~$ sudo systemctl reload sshd
:~$ sudo systemctl status sshd
● ssh.service - OpenBSD Secure Shell server
   Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Di 2018-05-15 10:00:04 CEST; 8s ago
  Process: 12089 ExecReload=/bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS)
  Process: 7536 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited, status=255)
 Main PID: 7536 (code=exited, status=255)
~~~

I would expect that a warning or error message is returned when the service fails while reloading it's configuration.

A fix for this behaviour would be appreciated.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: openssh-server 1:7.2p2-4ubuntu2.4
ProcVersionSignature: Ubuntu 3.13.0-112.159-generic 3.13.11-ckt39
Uname: Linux 3.13.0-112-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
Date: Tue May 15 10:18:25 2018
InstallationDate: Installed on 2013-01-10 (1950 days ago)
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
SourcePackage: openssh
UpgradeStatus: Upgraded to xenial on 2017-03-12 (428 days ago)
mtime.conffile..etc.pam.d.sshd: 2017-03-13T19:59:01.965420