'Need to define this method in order to remove the uri_opener from the
pickled string. This will make sure that when the object is un-pickled
we get the real uri_opener from w3af\'s core.
The object being un-pickled is the SQLMapShell, which when un-pickled
from the kb we call "shell.set_url_opener(w3af_core.uri_opener)",
which then calls start_proxy(uri_opener) in order to restore the opener'

def __reduce__(self):

    return (self.__class__, (self.target, None, self.coloring, self.debug))
