Fixed JIRA PUSH-244 : Turning on Level.FINE logging breaks setting the NotifyBackURI

git-svn-id: http://anonsvn.icesoft.org/repo/icepush/trunk/icepush@35650 1de00972-ac04-4911-a46b-06793c8d78d9
Fixed JIRA PUSH-245 : ConcurrentModificationException thrown from LocalPushGroupManager

git-svn-id: http://anonsvn.icesoft.org/repo/icepush/trunk/icepush@35651 1de00972-ac04-4911-a46b-06793c8d78d9