ACCUMULO-1243 Made tablet loading code only load one tablet when recovering a split.  Made code more strict, it will only load an exact tablet.  Made load code roll back splits that have started, but did not create a new tablet.  Added some more test.   

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1466211 13f79535-47bb-0310-9956-ffa450edef68