gossip: deflake TestGossipStorage
gossip: deflake TestGossipStorage

The network frequently fails to connect within 100 cycles when running
`make stress`.

cockroachdb/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,petermattis/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,bg451/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,nieyy/cockroach,arjun4084346/cockroach,cuongdo/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,maxlang/cockroach,nieyy/cockroach,sunya123/cockroach,cockroachdb/cockroach,nieyy/cockroach,sunya123/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,cuongdo/cockroach,cockroachdb/cockroach,petermattis/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,nieyy/cockroach,petermattis/cockroach,cockroachdb/cockroach,sunya123/cockroach,nieyy/cockroach,glycerine/cockroach,maxlang/cockroach,cockroachdb/cockroach,glycerine/cockroach,paperstreet/cockroach,glycerine/cockroach,nieyy/cockroach,sunya123/cockroach,arjun4084346/cockroach,cuongdo/cockroach,veteranlu/cockroach,petermattis/cockroach,maxlang/cockroach,cuongdo/cockroach,nieyy/cockroach,maxlang/cockroach,vivekmenezes/cockroach,maxlang/cockroach,cuongdo/cockroach,veteranlu/cockroach,paperstreet/cockroach,bg451/cockroach,petermattis/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,nieyy/cockroach,glycerine/cockroach,veteranlu/cockroach,cuongdo/cockroach,bg451/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,maxlang/cockroach,maxlang/cockroach,petermattis/cockroach,cuongdo/cockroach,sunya123/cockroach,sunya123/cockroach,veteranlu/cockroach,veteranlu/cockroach,veteranlu/cockroach,petermattis/cockroach,glycerine/cockroach,sunya123/cockroach,arjun4084346/cockroach,cuongdo/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,sunya123/cockroach,petermattis/cockroach,maxlang/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,bg451/cockroach,glycerine/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,arjun4084346/cockroach,paperstreet/cockroach,paperstreet/cockroach,glycerine/cockroach,bg451/cockroach,glycerine/cockroach,veteranlu/cockroach,paperstreet/cockroach,bg451/cockroach,bg451/cockroach