LPS-46460 Comments API: transfer all Message Boards references from BlogsEntryLocalServiceImpl

Hi @brianchandotcom!

This is https://github.com/brianchandotcom/liferay-portal/pull/19201#issuecomment-46127824 with an extra commit to drop the `__name__` pattern. Now we have a single, consistent style across all tests.

Thanks for your insights!