'Block, until the server has stopped.
Waits on the server\'s eventlet to finish, then returns.
:returns: None'

def wait(self):

    try:
        if (self._server is not None):
            self._pool.waitall()
            self._server.wait()
    except greenlet.GreenletExit:
        LOG.info(_LI('WSGI    server    has    stopped.'))
