Disable body caching for openstack services

This patch disables body caching for openstack services,
as this is useless for REST api.

Change-Id: Id8e9848b8f4696784015d99afe71c1784cded467
Related-Prod: PROD-24702
diff --git a/nginx/server/proxy/openstack/sahara.yml b/nginx/server/proxy/openstack/sahara.yml
index 17ae236..2aa1b5e 100644
--- a/nginx/server/proxy/openstack/sahara.yml
+++ b/nginx/server/proxy/openstack/sahara.yml
@@ -11,6 +11,8 @@
             host: ${_param:nginx_proxy_openstack_api_proxy_host}
             port: 8386
             protocol: http
+            # Prevent nginx from caching request body
+            request_buffer: false
           host:
             name: ${_param:nginx_proxy_openstack_api_host}
             port: 8386