* added IteratorGetNextCut, some improvements in graph.py
* added allowed types check
* reused new graph API for ports
* returned back old API 'out_nodes', removed soft-getting name from base class, changed run_after -> []
* correctly used new port API
* corrected IteratorGetNext message
* updated FasterRCNN and SSD analysis patterns
* updated tf od api conditions
* updated ssd patterns
* added more ssd topologies
* move preprocessor to tf od api condition
* update TF OD API conditions
* refactoring
* specify data type
* Removed test-generator from all MO requirement files except the dev one
* Moved all MO unit tests files to a separate directory
* Added __init__.py files to the tests directory. Fixed importing paths for some unit tests
* Fixed imports in all unit tests. Moved all unit test related files from the MO code to the dedicated directory
* Renamed directory with unit test utils
* Updated imports in unit tests