HBASE-8264 expose the number of seen KVs from StoreScanner

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1470032 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8377 IntegrationTestBigLinkedList calculates wrap for linked list size incorrectly

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1470049 13f79535-47bb-0310-9956-ffa450edef68