add vendor packages避免用户网络太慢无法下载编译

vendor/github.com/zr-hebo/util-db/conn_operation.go

@@ -0,0 +1,16 @@
+package db
+
+import (
+	"database/sql"
+)
+
+// CloseConnection 关闭数据库连接
+func CloseConnection(conn *sql.DB) (err error) {
+	err = conn.Close()
+	if err != nil {
+		return err
+	}
+
+	_, err = GetMySQLConnInfo(conn)
+	return
+}