fixed findbugs issues (removed invalid_pingers, not used)
fixed findbugs issues (removed invalid_pingers, not used)

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