small adaptations to py.impl move (should eventually not be neccessary to do such things)

testing/test_dsession.py

@@ -1,5 +1,5 @@
 from xdist.dsession import DSession
-from py.impl.test import outcome
+from py._test import outcome
 import py
 import execnet
 

testing/test_gwmanage.py

@@ -1,8 +1,8 @@
 import py
 import os
 from xdist.gwmanage import GatewayManager, HostRSync
-from py.impl.test.pluginmanager import HookRelay, Registry
-from py.plugin import hookspec
+from py._test.pluginmanager import HookRelay, Registry
+from py._plugin import hookspec
 import execnet
 
 def pytest_funcarg__hookrecorder(request):

testing/test_pickling.py

@@ -66,7 +66,7 @@ class TestImmutablePickling:
 
 class TestConfigPickling:
     def test_config_getstate_setstate(self, testdir):
-        from py.impl.test.config import Config
+        from py._test.config import Config
         testdir.makepyfile(__init__="", conftest="x=1; y=2")
         hello = testdir.makepyfile(hello="")
         tmp = testdir.tmpdir