R1:9f29af108bbb

Fix visibility of some `LiskDAO` methods

Summary: Ref T6822.

Test Plan: Ran unit tests.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T6822

Differential Revision: https://secure.phabricator.com/D11410