ACCUMULO-1010 fixed bug in mutation that was preventing upgrade of accumulo 1.4 to 1.5.

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1444984 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1060 - bug found, explanation in comments of ticket



git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1444996 13f79535-47bb-0310-9956-ffa450edef68