Allow setup to be run again as long as not-activated

this is useful if the activation fails somewhere mid-way and we don't
need to re-setup the cloudron all over

src/domaindb.js

@@ -8,8 +8,7 @@ exports = module.exports = {
     getAll: getAll,
     update: update,
     del: del,
-
-    _clear: clear
+    clear: clear
 };
 
 var assert = require('assert'),