Bug fix: Rollback fix to use Gossip info while grabbing dead and pre-assigned tokens.
(#826): Rollback the fixes to use Gossip info while grabbing dead and pre-assigned tokens. Gossip info doesn't not reflect the correct cluster state always. A node marked with status as NORMAL in the Gossip info could actually be down. This can be checked using nt ring. This change will unblock the nodes from joining the ring.