igt.py: Use grouptools

v2: - correct 'Proc' variable to use os.path instead of grouptools,
      since it is a path.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
xts.py: USe grouptools module and os.path appropriately

use grouptools when working with groups, and os.path only when working
with actual directory paths.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
oglconform.py: Use grouptools instead of os.path

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
oclconform.py: use grouptools module

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
opencv.py: use grouptools module

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>