#9608 fixing logging

this should fix logging issue, log should contain now:

```
2013-11-04 13:42:08,782 DEBUG [                      omeroweb.connector] (proc.08539) join_connection:191 Successfully joined connection: ...
2013-11-04 13:42:08,783 DEBUG [                      omeroweb.connector] (proc.08539) prepare_gateway:157 Successfully prepared gateway: ...
```