Issue CREATE DATABASE before ALTER TABLE in patch 88

Summary:
Sometimes the SQL account may not have CREATE DATABASE privileges, so try to
fail this script immediately rather than having it work halfway if the
permission is missing.

This is just a minor tweak to try to slightly improve some cases, the long term
fix is T345 but that's a good deal more work than this.

Test Plan: Visually inspected patch; trivial change.

Reviewers: jungejason, btrahan, skrul

Reviewed By: skrul

CC: aran, skrul

Differential Revision: https://secure.phabricator.com/D1287