This change executes the tests added to subplans.test and removes
a test which incorrectly references subplannull_data.test (a file
which does not exist)
Change-Id: I02b4f47553fb8f5fe3425cde2e0bcb3245c39b91
Reviewed-on: http://gerrit.cloudera.org:8080/7038
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Impala Public Jenkins