Get username in LLNG logs (#595)

_example/etc/manager-nginx.conf

@@ -2,6 +2,8 @@ server {
   listen __PORT__;
   server_name manager.__DNSDOMAIN__;
   root __MANAGERSITEDIR__;
+  # Use "lm_app" format to get username in nginx.log (see nginx-lmlog.conf)
+  #access_log /var/log/nginx/portal.log lm_app;
 
   if ($uri !~ ^/(.*\.psgi|static|doc|fr-doc|lib|javascript|favicon)) {
     rewrite ^/(.*)$ /manager.psgi/$1 break;

_example/etc/nginx-lmlog.conf

 log_format lm_combined '$remote_addr - $lmremote_user [$time_local] '
 	'"$request" $status $body_bytes_sent '
 	'"$http_referer" "$http_user_agent"';
+log_format lm_app '$remote_addr - $upstream_http_lm_remote_user [$time_local] '
+	'"$request" $status $body_bytes_sent '
+	'"$http_referer" "$http_user_agent"';

_example/etc/portal-nginx.conf

@@ -2,6 +2,8 @@ server {
   listen __PORT__;
   server_name auth.__DNSDOMAIN__;
   root __PORTALSITEDIR__;
+  # Use "lm_app" format to get username in nginx.log (see nginx-lmlog.conf)
+  #access_log /var/log/nginx/portal.log lm_app;
 
   if ($uri !~ ^/((static|javascript|favicon).*|.*\.psgi)) {
     rewrite ^/(.*)$ /index.psgi/$1 break;