Add support for RabbitMQ cluster.

framework/src/Volo.Abp.RabbitMQ/Volo/Abp/RabbitMQ/ConnectionPool.cs

@@ -26,10 +26,13 @@ namespace Volo.Abp.RabbitMQ
 
             return Connections.GetOrAdd(
                 connectionName,
-                () => Options
+                () =>
-                    .Connections
+                {
-                    .GetOrDefault(connectionName)
+                    var connection = Options.Connections.GetOrDefault(connectionName);
-                    .CreateConnection()
+                    var hostnames = connection.HostName.TrimEnd(';').Split(';');
+                    // Handle Rabbit MQ Cluster.
+                    return hostnames.Length == 1 ? connection.CreateConnection() : connection.CreateConnection(hostnames);
+                }
             );
         }