Revert "DB IDO: Add check_source_object_id reference to endpoint objects."

There's not necessarily a 1:1 relation between the check source node
name and the endpoint name.

This reverts commit a26df23e3d55abee4d0bd3c34da49d63702d209f.

Refs #5810
Refs #5636

Signed-off-by: Michael Friedrich <michael.friedrich@netways.de>
Set check source only on local instance (empty authority).

Fixes #5824

Signed-off-by: Michael Friedrich <michael.friedrich@netways.de>