Make default database namespace configurable

Summary: Allow the default namespace to be set in configuration, so you can juggle multiple copies of sandbox test data or whatever.

Test Plan: Changed default namespace, verified web UI and "storage" script respect it.

Reviewers: btrahan, vrana, jungejason

Reviewed By: vrana

CC: aran

Maniphest Tasks: T345

Differential Revision: https://secure.phabricator.com/D2341

scripts/sql/manage_storage.php

@@ -40,7 +40,7 @@ $conf = PhabricatorEnv::newObjectFromConfig('mysql.configuration-provider');
 $default_user       = $conf->getUser();
 $default_password   = $conf->getPassword();
 $default_host       = $conf->getHost();
-$default_namespace  = 'phabricator';
+$default_namespace  = PhabricatorLiskDAO::getDefaultStorageNamespace();
 
 try {
   $args->parsePartial(