perf: Avoids logging INFO for rest-util requests, since it hurts pull query performance (#4302)

* perf: Avoids logging INFO for rest-util requests, since it hurts pull query performance

Author: AlanConfluent

config/log4j-rolling.properties

@@ -77,3 +77,5 @@ log4j.additivity.org.apache.kafka=false
 log4j.logger.org.I0Itec.zkclient=WARN, kafka
 log4j.additivity.org.I0Itec.zkclient=false
 
+# To achieve high throughput on pull queries, avoid logging every request from Jetty
+log4j.logger.io.confluent.rest-utils.requests=WARN