deb: status action return non-zero when services are stopped

According to [LSB][1], exit code should be non-zero when the services
are not running.

This fix is useful for automated monitoring or testing.

[1]: http://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
Merge pull request #62 from orangain/feature-status-exit-code

deb: status action return non-zero when services are stopped

exit code of status action should be non-zero when services are not running.

GitHub: #62

Patch by @orangain. Thanks!!!