Fix an error in redis-trib where we always talk with same node.
Fix an error in redis-trib where we always talk with same node.

While iterating the list of nodes we want to set the slot as stable in
the current node, not always in the first node of the list.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis