sandbox: Fix to use new-style config files
sandbox: Fix to use new-style config files

The config file format changed in commit
2b53cd5d3aaf046c413fd4afb188c16d7e611f48.

outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker