Summary:
Ref T12450. Normally, we validate config when:
- You restart the webserver.
- You edit it with `bin/config set ...`.
- You edit it with the web UI.
However, you can also change config by editing `local.json`, `some_env.conf.php`, a `SiteConfig` class, etc. In these cases, you may miss config warnings.
Explicitly re-run search config checks from `bin/search`, similar to the additional database checks we run from `bin/storage`, to try to produce a better error message if the user has made a configuration error.
Test Plan:
```
$ ./bin/search init
Usage Exception: Setting "cluster.search" is misconfigured: Invalid search engine type: elastic. Valid types are: elasticsearch, mysql.
```
Reviewers: chad, 20after4
Reviewed By: 20after4
Maniphest Tasks: T12450
Differential Revision: https://secure.phabricator.com/D17574
5f939dcce0