Deal with tools.jar problems on OSX JDK7

Some OSX JDK's use classes.jar instead of tools.jar, and some don't. JDK's that use classes.jar will refuse to build projects that pull in tools.jar (e.g. because of a byteman dependency) unless the project has this fix. 

Rather than adding this to every project as these problems are discovered I thought it might make more sense to add this to the parent pom.