sql: Maintain a list of ordered virtual table names
sql: Maintain a list of ordered virtual table names

There are a few cases where virtual tables need to be iterated over
in-order. A map lacks this property, so we now maintain a sorted list
of names alongside the map.

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