HIVE-7725 : CBO : Move join counting from genPlan() to phase1 (Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1618060 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7732 CBO:JoinOrder Algo update to use HiveRels (John Pullokkaran via Harish Butani)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/cbo@1618083 13f79535-47bb-0310-9956-ffa450edef68