This needs to handle the case where redis-server is not running. If I run the command normally and redis-server is not running, I see:

```
(varify-env)[vagrant@000f20745045 varify]$ rqinfo -W -i 0
Error 111 connecting localhost:6379. Connection refused.
```

And when run like it is above, you will get the following error:

```
>>> output = subprocess.check_output(['rqinfo', '-W', '-i', '0'])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Python-2.7.3/lib/python2.7/subprocess.py", line 544, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['rqinfo', '-W', '-i', '0']' returned non-zero exit status 1
```