Created by: lidanqing-intel

1. The conv transpose with groups>1 could not pass python UT. Because there are no models using the group conv transpose till now, it was not tested.

2. As disscussed with @jczaja the original implementation is done in 2017 and back then there is no mkldnn reorder provided. Now mkldnn support the reorder and group conv transpose. We should find time to rewrite this part.

3. As there is no models using it, it is not that urgent. Just the UT test could not cover those parts with groups>1