elections: use set-forwarded-headers: replace for now

This should 'fix' broken redirects in the elections UI, see
https://pagure.io/fedora-infrastructure/issue/12997 .

This probably isn't ultimately the correct fix but it should make
things work for now. The real issue seems to be that elections'
custom WSGI app wrapper which attempts to handle the app being
reverse-proxied doesn't handle all proxied headers and/or doesn't
handle comma-separated list values. The long-term fix is likely
to be using werkzeug/middleware/proxy_fix.py instead, see
https://pagure.io/elections/issue/106 .

Signed-off-by: Adam Williamson <awilliam@redhat.com>

playbooks/openshift-apps/elections.yml

@@ -114,6 +114,8 @@
     route_host: "elections{{ env_suffix }}.fedoraproject.org"
     route_serviceport: 8000-tcp
     route_servicename: elections
+    route_annotations:
+      haproxy.router.openshift.io/set-forwarded-headers: replace
 
   - role: openshift/object
     object_app: elections