DERBY-5363 Tighten permission on db files to owner

Update policy files to add  RuntimePermission "accessUserInformation"
and read permission on trace files. Partial merge on revision 1180713




git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.8.3.1_testcompat@1465857 13f79535-47bb-0310-9956-ffa450edef68