Fix a stability issue relating to switch disconnection/re-connection events.

If a switch gets disconnected via a network interruption on the control plane (or a similar event),
the datapath associated with that switch might not be properly cleaned up.

At the same time, the socket associated with that datapath can get leaked.
This ultimately results in file descriptor resource exhaustion for Ryu,
as a socket had the potential to be leaked on each reconnect.

Also, a small typo was corrected in a method name in DPSet.

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