server: fix go1.7 vet error about unkeyed field in composite literal
server: fix go1.7 vet error about unkeyed field in composite literal

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