add redis-exporter for maat-redis.

roles/adc_exporter_proxy/templates/nginx.conf.j2

@@ -140,5 +140,9 @@ http {
 	    location /metrics/blade/mcn3/mrapm_stream {
                     proxy_pass   http://192.168.100.4:8902/metrics;
             }
+
+            location /metrics/blade/mcn0/maat_redis {
+                    proxy_pass   http://192.168.100.1:9121/metrics;
+            }
     }
 }