Snapshots are not typed, and no check is done when restoring

Description

FD cannot know which objectType was a snapshot of, so when restoring the snapshot it just insert the LDIF saved without performing any check or processing.

FusionDirectory Version

1.2

Steps to Reproduce

1. Snapshot a user
2. Delete it
3. Create a user with the same uid ("Login") elsewhere
4. Restore the snapshot

Expected behavior:

The restore should fail in some way because uid is a unique field.

Actual behavior:

The snapshot is restored with no error and you get a duplicated uid

Additional Information

One possible solution:

1. Store the objectType along with the snapshot
2. Open the snapshoted LDIF through the stored objectType
3. Save the opened object unless there are errors

(This is a bit similar to the process used when copy/pasting entries)

Related to fd-plugins#5631 (closed)