Comment 11 for bug 1293990

The fix needs to be slightly different. This is how 13.07.3 behaves:
ubuntu@server-d3b53f12-ca66-486f-b82f-f87ff392df3c:~$ l /etc/landscape/
total 12K
drwxr-xr-x 2 root root 4.0K Mar 25 13:55 .
drwxr-xr-x 86 root root 4.0K Mar 25 13:53 ..
-rw------- 1 landscape root 164 Mar 25 13:55 client.conf
ubuntu@server-d3b53f12-ca66-486f-b82f-f87ff392df3c:~$ landscape-sysinfo
  System load: 1.07 Processes: 60
  Usage of /: 8.8% of 9.84GB Users logged in: 1
  Memory usage: 3% IP address for eth0: 10.55.32.37
  Swap usage: 0%

  Graph this data and manage this system at:
    https://landscape.canonical.com/
ubuntu@server-d3b53f12-ca66-486f-b82f-f87ff392df3c:~$ landscape-sysinfo -c /etc/landscape/client.conf
error: config file /etc/landscape/client.conf can't be read
ubuntu@server-d3b53f12-ca66-486f-b82f-f87ff392df3c:~$

In summary, sysinfo in 14.01 should not complain if:
a) the *default* config file does not exist
b) the *default* config file is not readable

It should complain if the file specified by -c:
a) does not exist
b) is not readable