Simplify test_id generation to support tests running in parallel

Generating monotonically increasing number for test_id only works
when tests are run sequentially. To support running in parallel,
let's just use pytest's request.node.nodeid attribute to get the
same behavior we had before using unittest.TestCase.id (e.g.
cudapy/test_foo.py::TestFoo::test_foo1)

Author: acosmicflamingo

numba_cuda/numba/cuda/tests/support.py

@@ -223,17 +223,11 @@ def override_config(name, value):
         setattr(config, name, old_value)
 
 
-# This can certainly be divided into two pytest fixtures. However, doing so
-# means developers will have to import both 'test_id_generator' and the fixture
-# returning the itertools.count() generator. Importing could be avoided
-# altogether by adding the fixtures in conftest.py, but that potentially
-# pollutes the namespace
+# Returns string in following style:
+# 'cudapy/test_foo.py::TestFoo::test_foo1'
 @pytest.fixture(name="test_id")
 def test_id_generator(request):
-    cls = request.cls
-    if not hasattr(cls, "_test_id_counter"):
-        cls._test_id_counter = itertools.count()
-    yield next(cls._test_id_counter)
+    yield request.node.nodeid
 
 
 def make_dummy_type(test_id):