src: move src behind proxy varnish

Hopefully this will help the high ai scraper load and not break
anything.

In the event we need to revert, simply change the proxyurl back to the
haproxy endpoint instead of the varnish endpoint.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

playbooks/include/proxies-reverseproxy.yml

@@ -639,7 +639,8 @@
   - role: httpd/reverseproxy
     website: src.fedoraproject.org
     destname: git
-    proxyurl: http://localhost:10057
+    #proxyurl: http://localhost:10057
+    proxyurl: "{{ varnish_url }}"
     header_scheme: true
     keephost: true
     when: env != "staging"