ACCUMULO-1314 made PasswordToken init work w/ multi-byte chars and clear intermediate byte buffer.  Made AuthToken props fail after destroyed

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1469971 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1314 fixed shelltest bug introduced in r1469651

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1470041 13f79535-47bb-0310-9956-ffa450edef68