Poor performance in WlItemHandler.closeWlStream(WlStream)

[vladap]

WlItemHandler.closeWlStream removes stream from _streamList LinkedList. The operation is slow for a large list. It is the same problem like in already fixed issue #247 but for some reason this instance of LinkedList was not changed to LinkedHashSet/HashSet. It happens on complete disconnection from a backbone when all streams have to be reconnected.

[ViktorYelizarov]

@vladap Thank you for bringing this issue to our attention! We created an internal Jira to investigate it.