Clear varnish on Acquia from drupal site. Uses Guzzle HTTP client Instead of
cURL https://www.drupal.org/node/1862446
Acquia recommends you build with Cloud API v2.
https://cloudapi-docs.acquia.com/

This module provides any drupal user with permissions to manually purge Acquia
Cloud varnish cache. Purge varnish cache for each environment that you have.
It uses the acquia cloud API V2 as Acquia recommend.