Pass symbolic option to config_var endpoint
Pass symbolic option to config_var endpoint

When passed, symbolic representations of attached resources are rendered
instead of their actual values.  One also requires a feature flag to see
this.

dickeyxxx/heroku,sancopanco/heroku,macedo/heroku,greeca0204/heroku,gregburek/heroku,dickeyxxx/heroku,duypq94/heroku,Faisalawanisee/heroku,gregburek/heroku,vcgato29/heroku,greeca0204/heroku,duypq94/heroku,greeca0204/heroku,rkh/heroku,macedo/heroku,sancopanco/heroku,dickeyxxx/heroku,duypq94/heroku,rkh/heroku,sancopanco/heroku,Faisalawanisee/heroku,vcgato29/heroku,macedo/heroku,rkh/heroku,Faisalawanisee/heroku,vcgato29/heroku,gregburek/heroku