Cluster: don't set the slot as unassigned because of PONG info.
Cluster: don't set the slot as unassigned because of PONG info.

As stated in the comment this is usually due to a resharding in progress
so the client should be still redirected to the old node that will
handle the redirection elsewhere.

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