Up the max wait to 10 secs from 8 for busy machines doing other things while a Log4j build runs in the bg. Using a longer sleep interval to let the mini-server run.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1598684 13f79535-47bb-0310-9956-ffa450edef68
Add defaultClass() since we can have a Class has an attribute value.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1598688 13f79535-47bb-0310-9956-ffa450edef68