ACCUMULO-1284 use different scanners for root/meta sections, limit scan to the tablet info range 

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1468934 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1284 use different scanners for root/meta sections, limit scan to the tablet info range

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1468935 13f79535-47bb-0310-9956-ffa450edef68