fix broken DatabaseConfigurationProvider interface

Summary: broken by rPd27e7c52b21865563bd56f37d5d422515aa40bb7

Test Plan: sigh

Reviewers: epriestley, edward, levijackson

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6816

src/infrastructure/storage/configuration/DatabaseConfigurationProvider.php

@@ -13,6 +13,7 @@ interface DatabaseConfigurationProvider {
   public function getUser();
   public function getPassword();
   public function getHost();
+  public function getPort();
   public function getDatabase();
 
 }