adjust svn:ignore property

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599237 13f79535-47bb-0310-9956-ffa450edef68
OAK-1266 - experimental support for MySQL

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1599253 13f79535-47bb-0310-9956-ffa450edef68