Partial fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=56546
Avoid stack trace with org.apache.catalina.connector.TestMaxConnections
Ensure request processing has finished by increasing unload delay to allow request that was waiting in the accept queue to be processed before shutdown completes.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1596779 13f79535-47bb-0310-9956-ffa450edef68