fix to 4.2.0 uid and gid checking

I attempted to use FILE uid and gid checking in hobbit-clients.cfg. I ran into the same problem listed below on an e-mail dating back to 2007. There was not a thread that showed a correction to the problem so I search your source code for the problem. I found it in the module client_config.c. In your original 4.2.0 code, the +8 below were +6.