added synchronization around getHeaders() (https://jira.jboss.org/jira/browse/JGRP-805)
added synchronization around getHeaders() (https://jira.jboss.org/jira/browse/JGRP-805)

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