TEIID-2584: Improvements upon previous commit

1) moved tranformations to its own SYSADMIN.Transformations table, and prefixed names with teiid-rel: namespace
2) Improved the return parameter of load procedure based on action taken by the procedure for loading
3) Added VDB start and shutdown scripts to be added on the view, rather than to auto generate as previous version
4) Added matview sharing scope on the matview table, with which a table can be shared among vdb versions, all vdbs or none