ACCUMULO-259 Simplified new API related to AuthenticationToken after discussion w/ Christopher and Eric

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1469113 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-259 Simplified new API related to AuthenticationToken after discussion w/ Christopher and Eric

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1469120 13f79535-47bb-0310-9956-ffa450edef68