Upgraded JGroups to 3.5.0.Beta7 and changed readAll() to new signature o...

Upgraded to JGroups 3.5.0.Beta7, whose internal discovery API has changed slightly. 3.5 final should be released by mid-July, so it's up to you whether you want this to live in a separate branch and go with 3.4.x or swithc to beta7 already...