Update test expectations

Author: michaelklishin

test/unit_inbroker_SUITE.erl

@@ -1696,15 +1696,15 @@ credit_flow_settings(Config) ->
 
 credit_flow_settings1(_Config) ->
     %% default values
-    passed = test_proc(200, 100),
+    passed = test_proc(400, 200),
 
-    application:set_env(rabbit, credit_flow_default_credit, {100, 300}),
-    passed = test_proc(100, 300),
+    application:set_env(rabbit, credit_flow_default_credit, {600, 300}),
+    passed = test_proc(600, 300),
 
     application:unset_env(rabbit, credit_flow_default_credit),
 
     % back to defaults
-    passed = test_proc(200, 100),
+    passed = test_proc(400, 200),
     passed.
 
 test_proc(InitialCredit, MoreCreditAfter) ->