Test for IMPALA-2987

Add a custom cluster test that tests for delays in registering data
stream receivers. We add a stress option to artificially delay this
registration to ensure that it can be handled correctly.

Change-Id: Id5f5746b6023c301bacfa305c525846cdde822c9
Reviewed-on: http://gerrit.cloudera.org:8080/2306
Tested-by: Internal Jenkins
Reviewed-by: Silvius Rus <srus@cloudera.com>

testdata/workloads/functional-query/queries/QueryTest/exchange-delays.test

@@ -0,0 +1,10 @@
+====
+---- QUERY
+select count(*)
+from tpch.lineitem
+  inner join tpch.orders on l_orderkey = o_orderkey
+---- RESULTS
+6001215
+---- CATCH
+Sender timed out waiting for receiver fragment instance
+====