Create new databases with appropriate collation

Summary: Ref T1191. We don't create new databases with appropriate collation yet.

Test Plan:
Created a new database and saw it issue:

>>> [10] <query> CREATE DATABASE IF NOT EXISTS `phabricator2_testo` COLLATE utf8mb4_bin

Reviewers: btrahan, hach-que

Reviewed By: hach-que

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10632