TAJO-158: Can't allocate worker when single SubQuery requests more than cluster capacity. (hyoungjunkim via hyunsik)
TAJO-159: QueryMaster cannot connect the remote CatalogServer. (hyunsik)
TAJO-80: Remove codes of legacy data paths. (jihoon)
TAJO-149: Initial work.
Completed TAJO-149. Remain cluster tests.
TAJO-152: The tajo local directory path is mismatched in PullServer. (jihoon)
TAJO-167: Implement GeneralSetFunctionExpr to represent all SQL standard set functions. (hyunsik)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into CBO

Conflicts:
	tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/Repartitioner.java
	tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/querymaster/SubQuery.java
Merge branch 'TAJO-149' of github.com:hyunsik/incubator-tajo into CBO
Merge branch 'TAJO-167' of github.com:hyunsik/incubator-tajo into CBO
Before rewrite ProjPushDown.
Improved ProjectionPushDown to deal insert query.
Improved visitTableSubQuery();