Increase rabbit_stream_queue_SUITE timetrap

And set the default of make start-cluster to 3 nodes.

Author: kjnilsson

deps/rabbit/test/rabbit_stream_queue_SUITE.erl

@@ -23,7 +23,7 @@
 -compile(export_all).
 
 suite() ->
-    [{timetrap, 5 * 60000}].
+    [{timetrap, 15 * 60000}].
 
 all() ->
     [

deps/rabbit_common/mk/rabbitmq-run.mk

@@ -352,7 +352,7 @@ stop-node:
 # Start a RabbitMQ cluster in the background.
 # --------------------------------------------------------------------
 
-NODES ?= 2
+NODES ?= 3
 
 start-brokers start-cluster: $(DIST_TARGET)
 	@for n in $$(seq $(NODES)); do \