Sender element tries to re-open the port after closing the port of sender.

[s-takeuchi]

Create following data flow.

DF1 [Load data]---[Sender(Repeater) without socket close]
DF2 [Empty box]---[Wait 3sec]---[Close port]---[Empty box]

Sender(Repeater) re-opens the closed port after [Close port] element's port closure.
1: Should sender re-open the port which is closed in previous process?
2: Should sender give up the port re-opening?

Needs to consider the correct behavior.

In case of Receiver, same phenomenon has not been confirmed howerver implementation does not consider the same.

This issue is associating to the old trac-ticket#113.