change use of store namespace/prefix in sql store

store/options.go

@@ -4,6 +4,15 @@ import (
 	"github.com/micro/go-micro/config/options"
 )
 
+type Options struct {
+	// nodes to connect to
+	Nodes []string
+	// Namespace of the store
+	Namespace string
+	// Prefix of the keys used
+	Prefix string
+}
+
 // Nodes is a list of nodes used to back the store
 func Nodes(a ...string) options.Option {
 	return options.WithValue("store.nodes", a)