* add detection of Linux distribution
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: disable ONNX unit-tests if CentOS detected (temporar solution)
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: correct DISTRIB_ID name for CentOS
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>