DAL: remove attester from DAL attestation operation

Eugen Zalinescurequested to merge
eugenz@dal-remove-attester-from-attestation-op into master

Now that there is the slot field in the attestation op, we don't need the attester field anymore, as for the consensus attestation op.

Closes #4165 (closed).

Edited by Eugen Zalinescu

Merge request reports