[Py] Fix of the failing tests: test_unary_op_array & test_unary_op_scalar (#3086)
[Py] Fix of the failing tests: test_unary_op_array & test_unary_op_scalar (#3086)

* Fix of the failing tests: test_unary_op_array & test_unary_op_scalar

* Parametrize the logical_not test with input_data

* Code formatting

* Whitespace removal because flake8

NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph,NervanaSystems/ngraph