* onnx: add information about a domain to operators set
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: updates after review
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: update comments in the code
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix bug in node's description method
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix CentOS compilation
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: more after review changes
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>