Fix to make preload for external dataset agent idempotent
Bumped ion-definitions
DAMS extensions to edit external dataset agents and instances
Bumped ion-definitions
Bumped ion-definitions
Updated TESTED_DOC
Bumped ion-definitions to master
Merge pull request #1456 from mmeisinger/fix_glpre_m

Fix to make preload for external dataset agent idempotent /master
Bumped ion-definitions to master
Merge pull request #1458 from mmeisinger/fix1262_daedit_m

OOIION-1262: DAMS extensions to edit external dataset agents and instances /master
Moves the metadata about coverages into the object store

- Adds new method to dataset management to deal with latest data (and
  changes).
- Updates ingestion and dataset management to use the object store for
  metedata, avoids loading a coverage at all cost for metadata.
- Updates visualization and data product mgmt to use new format.
- Test(s)
Removes get_last_update
Fixes dmend2end tests