move down py/impl/XYZ to py/_XYZ

--HG--
branch : trunk

testing/io_/test_capture.py

@@ -58,7 +58,7 @@ def test_bytes_io():
     assert s == tobytes("hello")
 
 def test_dontreadfrominput():
-    from py.impl.io.capture import  DontReadFromInput
+    from py._io.capture import  DontReadFromInput
     f = DontReadFromInput()
     assert not f.isatty() 
     py.test.raises(IOError, f.read)

testing/io_/test_terminalwriter.py

@@ -1,6 +1,6 @@
 import py
 import os, sys
-from py.impl.io import terminalwriter 
+from py._io import terminalwriter 
 
 def test_terminal_width_COLUMNS(monkeypatch):
     """ Dummy test for get_terminal_width