hbase-8816: Add support of loading multiple tables into LoadTestTool

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1510058 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9120 ClassFinder logs errors that are not (Sergey)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1510088 13f79535-47bb-0310-9956-ffa450edef68