Improve alter privilege tests
Improve alter privilege tests

https://github.com/cockroachdb/docs/issues/216

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