move tests, merge test_extending files

Author: brandon-b-miller

numba_cuda/numba/cuda/tests/complex_usecases.py renamed to numba_cuda/numba/cuda/tests/cudapy/complex_usecases.py

@@ -9,7 +9,7 @@
 from numba.cuda.testing import unittest, CUDATestCase
 from numba.cuda import types
 from numba import cuda
-from numba.cuda.tests.complex_usecases import (
+from numba.cuda.tests.cudapy.complex_usecases import (
     real_usecase,
     imag_usecase,
     conjugate_usecase,

numba_cuda/numba/cuda/tests/enum_usecases.py renamed to numba_cuda/numba/cuda/tests/cudapy/enum_usecases.py

@@ -11,7 +11,7 @@
 from numba import cuda, vectorize, njit
 from numba.cuda import types
 from numba.cuda.testing import unittest, CUDATestCase, skip_on_cudasim
-from numba.cuda.tests.enum_usecases import (
+from numba.cuda.tests.cudapy.enum_usecases import (
     Color,
     Shape,
     Planet,