ACCUMULO-1323 made shell behave the way it did in 1.4 when no user was given and fixed shell unit test

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1469860 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1323 made shell behave the way it did in 1.4 when no user was given and fixed shell unit test

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1469896 13f79535-47bb-0310-9956-ffa450edef68