MODE-2394: Updates to the Vdb Sequencer in line with Teiid Schema

* Updates the Vdb sequencer's cnd model and lexicon to reflect the schema
  included in the latest version of teiid.
Yes. The was a correction since the VdbSequencer creates a Permissions node under DataRole and then adds each permission to the former. The existing vdb:permssion type (as entered in the cnd) is never used by the VdbSequencer.