Apply storage adjustments as part of storage upgrade

Summary:
Fixes T1191. I'll write up the changelog with notes about this and open a feedback task for followups.

When you run storage upgrade, automatically run storage adjust afterward. Provide a flag to disable this.

This brings everyone into the utf8mb4 world.

Test Plan: Ran bin/storage upgrade with various flags. Ran bin/storage adjust.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10800