Add redis driver

Signed-off-by: Asai Neko <sugar@sne.moe>

data/drivers/types.go

@@ -11,6 +11,14 @@ type ExternalDSN struct {
 	Password string
 }
 
+type RedisDSN struct {
+	Hosts    []string
+	Master   string
+	Username string
+	Password string
+	DB       int
+}
+
 type DBClient struct {
 	*gorm.DB
 }