'Check if the proxy is still running'

@gen.coroutine
def check_running(self):

    if (self.proxy_process.poll() is None):
        return
    self.log.error('Proxy    stopped    with    exit    code    %r', ('unknown' if (self.proxy_process is None) else self.proxy_process.poll()))
    (yield self.start())
    (yield self.restore_routes())
