replaced set for channel_listeners with CopyOnWriteSet
replaced set for channel_listeners with CopyOnWriteSet

TarantulaTechnology/JGroups,rpelisse/JGroups,slaskawi/JGroups,danberindei/JGroups,rvansa/JGroups,deepnarsay/JGroups,rvansa/JGroups,dimbleby/JGroups,TarantulaTechnology/JGroups,belaban/JGroups,pferraro/JGroups,slaskawi/JGroups,pferraro/JGroups,ibrahimshbat/JGroups,belaban/JGroups,pruivo/JGroups,rhusar/JGroups,tristantarrant/JGroups,ibrahimshbat/JGroups,pruivo/JGroups,rhusar/JGroups,ibrahimshbat/JGroups,slaskawi/JGroups,Sanne/JGroups,vjuranek/JGroups,ibrahimshbat/JGroups,tristantarrant/JGroups,rpelisse/JGroups,ligzy/JGroups,TarantulaTechnology/JGroups,kedzie/JGroups,ligzy/JGroups,kedzie/JGroups,Sanne/JGroups,kedzie/JGroups,deepnarsay/JGroups,rhusar/JGroups,vjuranek/JGroups,pruivo/JGroups,dimbleby/JGroups,belaban/JGroups,ligzy/JGroups,Sanne/JGroups,rpelisse/JGroups,deepnarsay/JGroups,vjuranek/JGroups,pferraro/JGroups,dimbleby/JGroups,danberindei/JGroups,danberindei/JGroups