adapt to new cockroach-prod
adapt to new cockroach-prod

For example,

`terraform  apply --var=num_instances=3 --var=key_name=cockroach-craig`

```
go test -v -tags acceptance ./acceptance \
  -peers node1,node2,node3 \
  -k ~/.ssh/cockroach-craig.pem \
  -run Chaos
```

cuongdo/cockroach,maxlang/cockroach,glycerine/cockroach,maxlang/cockroach,paperstreet/cockroach,petermattis/cockroach,glycerine/cockroach,veteranlu/cockroach,cockroachdb/cockroach,petermattis/cockroach,cockroachdb/cockroach,nieyy/cockroach,paperstreet/cockroach,paperstreet/cockroach,paperstreet/cockroach,paperstreet/cockroach,cockroachdb/cockroach,il9ue/cockroach,sunya123/cockroach,marcuswestin/cockroach,maxlang/cockroach,petermattis/cockroach,maxlang/cockroach,nieyy/cockroach,maxlang/cockroach,petermattis/cockroach,vaibhavarora/cockroach,bg451/cockroach,petermattis/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,cuongdo/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,glycerine/cockroach,glycerine/cockroach,cuongdo/cockroach,maxlang/cockroach,marcuswestin/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,marcuswestin/cockroach,veteranlu/cockroach,veteranlu/cockroach,veteranlu/cockroach,bg451/cockroach,nieyy/cockroach,glycerine/cockroach,bg451/cockroach,il9ue/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,cuongdo/cockroach,cockroachdb/cockroach,il9ue/cockroach,marcuswestin/cockroach,cockroachdb/cockroach,sunya123/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,nieyy/cockroach,vaibhavarora/cockroach,nieyy/cockroach,arjun4084346/cockroach,nieyy/cockroach,bg451/cockroach,maxlang/cockroach,glycerine/cockroach,veteranlu/cockroach,arjun4084346/cockroach,glycerine/cockroach,maxlang/cockroach,sunya123/cockroach,sunya123/cockroach,petermattis/cockroach,arjun4084346/cockroach,veteranlu/cockroach,marcuswestin/cockroach,paperstreet/cockroach,cockroachdb/cockroach,nieyy/cockroach,glycerine/cockroach,vaibhavarora/cockroach,il9ue/cockroach,il9ue/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,cuongdo/cockroach,bg451/cockroach,sunya123/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,marcuswestin/cockroach,il9ue/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,marcuswestin/cockroach,sunya123/cockroach,il9ue/cockroach,veteranlu/cockroach,cuongdo/cockroach,petermattis/cockroach,nieyy/cockroach,cuongdo/cockroach,bg451/cockroach,cuongdo/cockroach,paperstreet/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,sunya123/cockroach,marcuswestin/cockroach,sunya123/cockroach,bg451/cockroach,il9ue/cockroach,petermattis/cockroach