tests/tools_test: Add extra logging around chdirs

Sometimes we end up in /bin and I am not able to explain that just by
looking at the machine or the IGT tarball that was deployed there so
let's get some more breadcrumbs.

Cc: Petri Latvala <petri.latvala@intel.com>
Issue: #12


Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>