Add bmcweb to meta-ibm layer for redfish support

Put behind nginx and only activate when /redfish is
queried via https.

Testing: Verified that with this change in bmcweb:
https://gerrit.openbmc-project.xyz/#/c/openbmc/bmcweb/+/11518/
that redfish commands can successfully be sent via nginx
on the witherspoon qemu model.

Change-Id: I97509dc3484deffd06c3d60db710eb3b17dfccb5
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/recipes-httpd/nginx/files/nginx.conf b/recipes-httpd/nginx/files/nginx.conf
index 74010f9..89e575a 100644
--- a/recipes-httpd/nginx/files/nginx.conf
+++ b/recipes-httpd/nginx/files/nginx.conf
@@ -87,6 +87,10 @@
 
                  proxy_pass http://127.0.0.1:8081;
         }
+        location /redfish {
+                proxy_pass http://127.0.0.1:8082;
+                proxy_http_version 1.1;
+        }
 
         include /etc/nginx/sites-enabled/443_*.conf;
     }