Move vertx init and npm_modules.js loading to nodyn.js.

Also clean up some unused and/or unnecessary gunk in global.
Isolate __jvertx inside the Process ctor.
Remove unused code
Remove explicit EventEmitter property copy for util.inherits
Remove unused and undocumented process properties
Add process.exit and process.abort
Rename vertxCallback and vertxError for ease of searching
Rename mock dns server
Use process.exit() to clean up after tests