Remove pytest 2.8 compatibility code

src/xdist/plugin.py

@@ -154,11 +154,7 @@ def pytest_addoption(parser):
 def pytest_addhooks(pluginmanager):
     from xdist import newhooks
 
-    # avoid warnings with pytest-2.8
+    pluginmanager.add_hookspecs(newhooks)
-    method = getattr(pluginmanager, "add_hookspecs", None)
-    if method is None:
-        method = pluginmanager.addhooks
-    method(newhooks)
 
 
 # -------------------------------------------------------------------------

testing/conftest.py

@@ -1,7 +1,11 @@
+import six
 import py
 import pytest
 import execnet
 
+pytest_plugins = "pytester"
+
+if six.PY2:
 
     @pytest.fixture(scope="session", autouse=True)
     def _ensure_imports():
@@ -12,11 +16,6 @@ def _ensure_imports():
         execnet.makegateway
 
 
-pytest_plugins = "pytester"
-
-# rsyncdirs = ['.', '../xdist', py.path.local(execnet.__file__).dirpath()]
-
-
 @pytest.fixture(autouse=True)
 def _divert_atexit(request, monkeypatch):
     import atexit
@@ -45,14 +44,6 @@ def specssh(request):
     return getspecssh(request.config)
 
 
-@pytest.fixture
-def testdir(testdir):
-    # pytest before 2.8 did not have a runpytest_subprocess
-    if not hasattr(testdir, "runpytest_subprocess"):
-        testdir.runpytest_subprocess = testdir.runpytest
-    return testdir
-
-
 # configuration information for tests
 def getgspecs(config):
     return [execnet.XSpec(spec) for spec in config.getvalueorskip("gspecs")]