New test cases for the new replicate operator

    - added new execution and optimizer tests for replicate operator
    - fixed optimizer test plans after reducing live variables for unnestmap operator

Change-Id: If1341cc712542b0023cebb17bd0d16ee345b359d
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/88
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Yingyi Bu <buyingyi@gmail.com>
70 files changed