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>
(cherry picked from commit 68410105e9cafa320c2a1e82f20c1b83990627c0)
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4197
Reviewed-by: Henry Robinson <henry@cloudera.com>