IMPALA-13929: Make 'functional-query' the default workload in tests

This change adds get_workload() to ImpalaTestSuite and removes it
from all test suites that already returned 'functional-query'.
get_workload() is also removed from CustomClusterTestSuite which
used to return 'tpch'.

All other changes besides impala_test_suite.py and
custom_cluster_test_suite.py are just mass removals of
get_workload() functions.

The behavior is only changed in custom cluster tests that didn't
override get_workload(). By returning 'functional-query' instead
of 'tpch', exploration_strategy() will no longer return 'core' in
'exhaustive' test runs. See IMPALA-3947 on why workload affected
exploration_strategy. An example for affected test is
TestCatalogHMSFailures which was skipped both in core and exhaustive
runs before this change.

get_workload() functions that return a different workload than
'functional-query' are not changed - it is possible that some of
these also don't handle exploration_strategy() as expected, but
individually checking these tests is out of scope in this patch.

Change-Id: I9ec6c41ffb3a30e1ea2de773626d1485c69fe115
Reviewed-on: http://gerrit.cloudera.org:8080/22726
Reviewed-by: Riza Suminto <riza.suminto@cloudera.com>
Reviewed-by: Daniel Becker <daniel.becker@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

tests/query_test/test_insert_behaviour.py

@@ -34,10 +34,6 @@ from tests.util.filesystem_utils import WAREHOUSE, IS_S3
 @SkipIfLocal.hdfs_client
 class TestInsertBehaviour(ImpalaTestSuite):
   """Tests for INSERT behaviour that isn't covered by checking query results"""
-  @classmethod
-  def get_workload(self):
-    return 'functional-query'
-
   TEST_DB_NAME = "insert_empty_result_db"
 
   def setup_method(self, method):