Adds a Vdb Node Visitor for exporting modeshape vdb nodes

* vdb.cnd
 * Additions to vdb:node types aligning with the teiid 8.9 changes

* AbstractNodeVisitor
 * Adds abstract parent to utils extended by each of the node visitors
 * Takes care of the teiid version field

* modeshape.vdb
 * Plugin for handling vdb export, processing and deployment

* VdbNodeVisitor
 * Visitor that walks a vdb:node and converts it into teiid compliant
   xml for dynamic vdbs

* test-repository-config.json
 * Moves the brackets around the initial workspace to ensure that
   sequencers add their new nodes to the location in the correct workspace

* vdb.test plugin for unit testing vdb node visitor
WIP