green select: Delete unpatched methods

Explanation in the comment in the code.

eventlet/green/select.py

@@ -6,6 +6,7 @@ from eventlet.support import six
 
 
 __patched__ = ['select']
+__deleted__ = ['poll', 'epoll', 'kqueue', 'kevent']
 
 
 def get_fileno(obj):

eventlet/patcher.py

@@ -295,6 +295,10 @@ def monkey_patch(**on):
                 patched_attr = getattr(mod, attr_name, None)
                 if patched_attr is not None:
                     setattr(orig_mod, attr_name, patched_attr)
+            deleted = getattr(mod, '__deleted__', [])
+            for attr_name in deleted:
+                if hasattr(orig_mod, attr_name):
+                    delattr(orig_mod, attr_name)
     finally:
         imp.release_lock()
 

tests/isolated/patcher_blocking_select_methods_are_deleted.py

@@ -0,0 +1,15 @@
+if __name__ == '__main__':
+    import eventlet
+    eventlet.monkey_patch()
+
+    # Leaving unpatched select methods in the select module is a recipe
+    # for trouble and this test makes sure we don't do that.
+    #
+    # Issues:
+    # * https://bitbucket.org/eventlet/eventlet/issues/167
+    # * https://github.com/eventlet/eventlet/issues/169
+    import select
+    for name in ['poll', 'epoll', 'kqueue', 'kevent']:
+        assert not hasattr(select, name), name
+
+    print('pass')

tests/patcher_test.py

@@ -510,3 +510,7 @@ def test_threading_join():
 
 def test_socketserver_selectors():
     tests.run_isolated('patcher_socketserver_selectors.py')
+
+
+def test_blocking_select_methods_are_deleted():
+    tests.run_isolated('patcher_blocking_select_methods_are_deleted.py')