DERBY-6662; DatabaseMetaData.usesLocalFiles() returns true for in-memory databases
  merge of revision 1627671 and 1627851 from trunk


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.11@1627895 13f79535-47bb-0310-9956-ffa450edef68