HBASE-10419 Add multiget support to PerformanceEvaluation

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1569826 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10534 Rowkey in TsvImporterTextMapper initializing with wrong length(Rajesh)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1569837 13f79535-47bb-0310-9956-ffa450edef68