Nuxeo Drive crash when the local file & folder paths are too long and nested under Windows

TODO:

• change the test setup to put the root of the temporary test folder under a path with length 250 (windows max path length is around 255 chars).

• observe the tests crashing

• fix by either modifying the normalize_path function to add a \\?\ prefix under sys.platform == win32 or by adding this prefix only when calling open or os.listdir in the LocalClient class.

Reference: http://msdn.microsoft.com/en-us/library/aa365247.aspx#maxpath