Fix Findbugs warning

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456474 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54660
Allow the AccessLogValve file data format to be changed via JMX. The change takes effect as soon as the next message is logged.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456491 13f79535-47bb-0310-9956-ffa450edef68
Fix import order (checkstyle)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456494 13f79535-47bb-0310-9956-ffa450edef68