Make binding to a specific network really work. Also added priv
dropping so process doesn't have to run as root for process lifetime.

BKrev: 40df35a4eUCTfC660C7oBwg-P9YE2g


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@28 fd59a12c-fef9-0310-b244-a6a79926bd2f