store/sqlstore cleanup and postgres tests (#7595)

* sqlstore cleanup / postgres tests

* remove stopped containers

* cmd/platform compile fix

* remove test-postgres target from makefile

store/sqlstore/store.go

@@ -40,6 +40,7 @@ import (
 }*/
 
 type SqlStore interface {
+	DriverName() string
 	GetCurrentSchemaVersion() string
 	GetMaster() *gorp.DbMap
 	GetSearchReplica() *gorp.DbMap