don't use legacy test API

To avoid duplicates in binaries

Do not try to process empty inputs.

Details 12176

remove from DNN module headers

	* Keep image aspect ratio in resize called in grad_system and
weak_order
	* Bug correction in loop inside Decolor::gradvector

* core(test): merge hang test

* core(merge/split): fix intrin optimization

fixed call open(int id) failed