ACCUMULO-1088 when new tservers a noticed, remove any matching bad server information

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1449755 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1088 when new tservers are noticed, remove any matching bad server information

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1449757 13f79535-47bb-0310-9956-ffa450edef68