Fix KNearestNeighborsMachineLearningModel

Summary

closes #2181 (closed)

when using OpenCV >= 3 in OTB, the KNN machine learning model writes the number of neighbors that should be used in the training step, but this number is not read back when loading the model. As a consequence, the default number of neighbor (32) is always used.

Copyright

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changed milestone to %8.0.0

it reminds me !769 (merged)

changed the description

added bug label

mentioned in commit c7854677

merged