Allow to limit JUnit test run to a number of selected test case methods. 

BUILDING.txt says that Ant 1.8.x is needed.
If we require a later version of Ant, e.g. 1.9.3 due to javadoc task security fixes,
then Ant 1.8.2 comment in BUILDING.txt can be removed.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1570601 13f79535-47bb-0310-9956-ffa450edef68