_printGeneratedPasswordWhenNotOverridden(url) {
    if (this.opts.auth.pass.length !== 40) {
      return
    }
    console.info(`
      DevTools Tunnel: You haven't specified basic auth credentials.

      Here are the generated ones, for your convenience:

        - user: 'user'
        - pass: '${this.opts.auth.pass}'

      Public Url: ${url}

      You can specify your own auth credentials when instantiating the plugin,
      or by using the plugin.setAuthCredentials(user, pass) method.
    `)
  }
Prints the generated auth credentials, when not overriden by the user.

As the tunnel is public we make basic auth a requirement,
without forcing the user to specify their own credentials.

@ignore