Adds CTGV UTIL test

- Refines CTDGV test and fixes preload scenarios for test
Adds support for TableDAP and DAP Sequences in lieu of grids

- Adds Test
- Changes to the pydap handler
- Changes to the registration process
Merge pull request #1483 from lukecampbell/tabledap-r2

Adds support for TableDAP and DAP Sequences OOIION-1405