Tweaks for jenkins reverse proxy will SSL.

playbooks/roles/jenkins_master/templates/etc/nginx/sites-available/jenkins.j2

@@ -4,6 +4,13 @@ server {
 
   location / {
     proxy_pass              http://localhost:{{ jenkins_port }};
+
+    # Rewrite HTTPS requests from WAN to HTTP requests on LAN
+    proxy_redirect http:// https://;
+
+    # The following settings from https://wiki.jenkins-ci.org/display/JENKINS/Running+Hudson+behind+Nginx
+    sendfile off;
+
     proxy_set_header        Host $host;
     proxy_set_header        X-Real-IP $remote_addr;
     proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;