Smart server tests fail on win32

Reported by Alexander Belchenko:
I'd like to run selftest without smart server tests on win32, because
there is too many failed tests related to smart server & smart
transport. In current bzr.dev there is 3 times traceback on stderr:

Exception in thread Thread-99:
Traceback (most recent call last):
  File "E:\Python24\lib\threading.py", line 442, in __bootstrap
    self.run()
  File "E:\Python24\lib\threading.py", line 422, in run
    self.__target(*self.__args, **self.__kwargs)
  File
"D:\Bazaar\sandbox\bzr.dev\bzrlib\tests\test_smart_transport.py", line
100, in _receive_bytes_on_server
    bytes.append(connection.recv(3, socket.MSG_WAITALL))
AttributeError: 'module' object has no attribute 'MSG_WAITALL'

And after selftest is complete bzr unable to remove temp directory
test0000.tmp with this error:

bzr: ERROR: [Errno 13] Permission denied:
u'D:/Bazaar/sandbox/bzr.dev/test0000.tmp\\blackbox.test_serve.TestBzrServe.test_bzr_se
rve_inet_readonly\\home\\.bzr.log'