Make system tests compatible with pytest 8.0.0+

The pytest collection mechanism has been overhauled in pytest 8.0.0,
resulting in a different node tree when collecting the tests. Ensure the
paths / names we're using that are derived from the node tree are
consistent across different pytest versions.

Particularly, this has affected the convenience symlink name (which is
supposed to be in the form of e.g. dns64_sh_dns64 for the dns64 module
and tests_sh_dns64.py module) and the test name that's logged at the
start of the test, which is supposed to include the system test
directory relative to the root system test directory as well as the
module name (e.g. dns64/tests_sh_dns64.py).

Related https://github.com/pytest-dev/pytest/issues/7777

bin/tests/system/conftest.py

@@ -355,7 +355,7 @@ def system_test_dir(request, system_test_name):
     isctest.vars.dirs.set_system_test_name(testdir.name)
 
     # Create a convenience symlink with a stable and predictable name
-    module_name = SYMLINK_REPLACEMENT_RE.sub(r"\1", request.node.name)
+    module_name = SYMLINK_REPLACEMENT_RE.sub(r"\1", str(_get_node_path(request.node)))
     symlink_dst = system_test_root / module_name
     unlink(symlink_dst)
     symlink_dst.symlink_to(os.path.relpath(testdir, start=system_test_root))
@@ -446,6 +446,15 @@ def _run_script(
         isctest.log.debug("  exited with %d", returncode)
 
 
+def _get_node_path(node) -> Path:
+    if isinstance(node.parent, pytest.Session):
+        if _pytest_major_ver >= 8:
+            return Path()
+        return Path(node.name)
+    assert node.parent is not None
+    return _get_node_path(node.parent) / node.name
+
+
 @pytest.fixture(scope="module")
 def shell(system_test_dir):
     """Function to call a shell script with arguments."""
@@ -543,7 +552,7 @@ def system_test(
             isctest.log.error("Found core dumps or sanitizer reports")
             pytest.fail(f"get_core_dumps.sh exited with {exc.returncode}")
 
-    isctest.log.info(f"test started: {request.node.name}")
+    isctest.log.info(f"test started: {_get_node_path(request.node)}")
     port = int(os.environ["PORT"])
     isctest.log.info(
         "using port range: <%d, %d>", port, port + isctest.vars.ports.PORTS_PER_TEST - 1