Public bug reported:

This is similar to #689734 I believe.

When starting haproxy using a DNS name on the 'server' line haproxy
fails to start, giving the message:

```
May 05 19:09:40 hyrule systemd[1]: Starting HAProxy Load Balancer...
May 05 19:09:40 hyrule haproxy[1146]: [ALERT] 124/190940 (1146) : parsing 
[/etc/haproxy/haproxy.cfg:157] : 'server scanmon' :
May 05 19:09:40 hyrule haproxy[1146]: [ALERT] 124/190940 (1146) : Failed to 
initialize server(s) addr.
May 05 19:09:40 hyrule systemd[1]: haproxy.service: Control process exited, 
code=exited status=1
May 05 19:09:40 hyrule systemd[1]: haproxy.service: Failed with result 
'exit-code'.
May 05 19:09:40 hyrule systemd[1]: Failed to start HAProxy Load Balancer.
```

In this case the server statement was:

`      server scanmon myservername.mydomain.org:8000`

Changing it to use the IP address corrected the problem.

I believe there is a missing dependency for DNS in the unit file.

--Info:
Description:    Ubuntu 18.04 LTS
Release:        18.04

haproxy:
  Installed: 1.8.8-1
  Candidate: 1.8.8-1
  Version table:
 *** 1.8.8-1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: haproxy (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1771335

Title:
  haproxy fails at startup when using server name instead of IP

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