a493c9c966
Resolves https://github.com/spring-projects/spring-integration/issues/3713 https://github.com/spring-projects/spring-integration/issues/3326 added support for multiple `TcpSenders`. However, when connections are intercepted, the sender list was not properly chained through the interceptors. - override `registerSenders` and properly capture the real senders in the last interceptor and intermediate interceptors - this ensures that `addNewConnection` is called on each interceptor - when removing dead connections, use the connection sender list insted of the factory's raw sender list; detect if the connection is an interceptor and call its remove method instead. **cherry-pick to 5.5.x**