Provides clean-up procedures for downloaded dependencies

* build.xml
 * Provides clean target for removing the maven downloaded libraries

* pom.xml
 * Adds in clean plugin for removing the downloaded libraries while
   performing a maven clean.
Includes the modeshape ddl jars back into the codebase

* Ensures the versions of the jars are compatible with product releases

* Disables maven and ant dynamic downloading of jars
Updates teiid 8.4.x submodule

* Updates merged into teiid 8.4.x client