Drop webserver rendering logging to VLOG(3)

Change-Id: Ic6e8b9b2dc98adca1982914a1714f82d13907ff7
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4196
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Tested-by: Henry Robinson <henry@cloudera.com>