[LOG4J2-383][Pattern Layout] Customize level name by length.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1519770 13f79535-47bb-0310-9956-ffa450edef68
LOG4J2-380 - Use rollover date when substituting  in the filePattern.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1519776 13f79535-47bb-0310-9956-ffa450edef68