DERBY-6180; DatabaseMetaDataTest should not fail if there are extra columns but only check the expected ones
  Moving the assertDatabaseMetaDataColumns method to junit.JDBC and making jdbc4.TestDbMetaData use it.


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1627578 13f79535-47bb-0310-9956-ffa450edef68