added missing synchronized block for toString method
added missing synchronized block for toString method

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