varnish close generates error when secret needed

[oppianmatt]

When you run varnish commands you can pass in secret like so:

manager.run('ban.url', '^%s' % url, secret=VARNISH_SECRET)

But if you call close it generates a 107 error. That's because it's calling close without a secret and there is no way to pass it in.

def close(self):
    self.run('close', threaded=True)
    self.servers = ()

Work around is to run

manager.run('close', secret=VARNISH_SECRET)