Minor change in integration tests

This uses the current time and a short uuid when creating test queues and exchanges.

Copied from rabbitmq/rabbitmq-amqp-dotnet-client

projects/Test/Common/IntegrationFixture.cs

@@ -450,12 +450,12 @@ protected async Task WithTemporaryChannelAsync(Func<IChannel, Task> action)
 
         protected string GenerateExchangeName()
         {
-            return $"{_testDisplayName}-exchange-{Guid.NewGuid()}";
+            return $"{_testDisplayName}-exchange-{Util.Now}-{GenerateShortUuid()}";
         }
 
         protected string GenerateQueueName()
         {
-            return $"{_testDisplayName}-queue-{Guid.NewGuid()}";
+            return $"{_testDisplayName}-queue-{Util.Now}-{GenerateShortUuid()}";
         }
 
         protected Task WithTemporaryNonExclusiveQueueAsync(Func<IChannel, string, Task> action)
@@ -664,5 +664,7 @@ protected void LogWarning(string text,
             _output.WriteLine("::warning file={0},line={1}::{2} {3}",
                 Path.GetFileName(file), line, member, text);
         }
+
+        private static string GenerateShortUuid() => S_Random.Next().ToString("x");
     }
 }