Make bin/storage dump insert CREATE DATABASE and USE statements
Ref T13000. The new approach for dumping database-by-database means that we don't get CREATE DATABASE or USE statements, which makes importing the dump again inconvenient.
Manually stitch these into the dump.
- Used bin/storage dump --namespace ... to dump a smaller local instance.
- Used bin/storage destroy --namespace ..., to destroy the namespace, then inported the dump cleanly.
- Verified that each CREATE DATABASE statement appears only once.
- Verified that bin/storage renamespace --live can correctly process this file.
Reviewed By: amckinley
Maniphest Tasks: T13000
Differential Revision: https://secure.phabricator.com/D18707