Check if reply code for "too many channels" is what we expect

Author: michaelklishin

test/src/com/rabbitmq/client/test/server/ChannelLimitNegotiation.java

@@ -94,6 +94,7 @@ public void shutdownCompleted(ShutdownSignalException cause) {
       ch.open();
       fail("expected channel.open to cause a connection exception");
     } catch (IOException e) {
+      checkShutdownSignal(530, e);
     } finally {
       Host.rabbitmqctl("eval 'application:set_env(rabbit, channel_max, 0).'");
     }