Merge pull request #1843 from uzh/disable-certs-in-sandbox

Disable installation of the "certs" service, as it's not used in sandbox

playbooks/edx_sandbox.yml

@@ -22,6 +22,7 @@
   roles:
     - role: nginx
       nginx_sites:
+      - certs
       - cms
       - lms
       - forum