Update tests to match new top level format

...or_identification/model/test_model_log_regressor_fit_c.cc

...ication/sisso_regressor/test_sisso_log_regressor_fit_c.cc

...t/feature_creation/parameterization/test_abs_diff_node.cc

...letest/feature_creation/parameterization/test_abs_node.cc

...letest/feature_creation/parameterization/test_add_node.cc

...gletest/feature_creation/parameterization/test_cb_node.cc

...etest/feature_creation/parameterization/test_cbrt_node.cc

...letest/feature_creation/parameterization/test_cos_node.cc

...letest/feature_creation/parameterization/test_div_node.cc

...letest/feature_creation/parameterization/test_exp_node.cc

...letest/feature_creation/parameterization/test_inv_node.cc

...letest/feature_creation/parameterization/test_log_node.cc

...etest/feature_creation/parameterization/test_mult_node.cc

...st/feature_creation/parameterization/test_neg_exp_node.cc

...letest/feature_creation/parameterization/test_sin_node.cc

...st/feature_creation/parameterization/test_six_pow_node.cc

...gletest/feature_creation/parameterization/test_sq_node.cc

...etest/feature_creation/parameterization/test_sqrt_node.cc

...letest/feature_creation/parameterization/test_sub_node.cc

...st/test_descriptor_identifier/test_log_regressor_fit_c.py