Use Go1.11 module (#5743)

* Migrate to go modules

* make vendor

* Update mvdan.cc/xurls

* make vendor

* Update code.gitea.io/git

* make fmt-check

* Update github.com/go-sql-driver/mysql

* make vendor

vendor/google.golang.org/appengine/cloudsql/cloudsql.go

@@ -0,0 +1,62 @@
+// Copyright 2013 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+/*
+Package cloudsql exposes access to Google Cloud SQL databases.
+
+This package does not work in App Engine "flexible environment".
+
+This package is intended for MySQL drivers to make App Engine-specific
+connections. Applications should use this package through database/sql:
+Select a pure Go MySQL driver that supports this package, and use sql.Open
+with protocol "cloudsql" and an address of the Cloud SQL instance.
+
+A Go MySQL driver that has been tested to work well with Cloud SQL
+is the go-sql-driver:
+	import "database/sql"
+	import _ "github.com/go-sql-driver/mysql"
+
+	db, err := sql.Open("mysql", "user@cloudsql(project-id:instance-name)/dbname")
+
+
+Another driver that works well with Cloud SQL is the mymysql driver:
+	import "database/sql"
+	import _ "github.com/ziutek/mymysql/godrv"
+
+	db, err := sql.Open("mymysql", "cloudsql:instance-name*dbname/user/password")
+
+
+Using either of these drivers, you can perform a standard SQL query.
+This example assumes there is a table named 'users' with
+columns 'first_name' and 'last_name':
+
+	rows, err := db.Query("SELECT first_name, last_name FROM users")
+	if err != nil {
+		log.Errorf(ctx, "db.Query: %v", err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var firstName string
+		var lastName string
+		if err := rows.Scan(&firstName, &lastName); err != nil {
+			log.Errorf(ctx, "rows.Scan: %v", err)
+			continue
+		}
+		log.Infof(ctx, "First: %v - Last: %v", firstName, lastName)
+	}
+	if err := rows.Err(); err != nil {
+		log.Errorf(ctx, "Row error: %v", err)
+	}
+*/
+package cloudsql
+
+import (
+	"net"
+)
+
+// Dial connects to the named Cloud SQL instance.
+func Dial(instance string) (net.Conn, error) {
+	return connect(instance)
+}

vendor/google.golang.org/appengine/cloudsql/cloudsql_classic.go

@@ -0,0 +1,17 @@
+// Copyright 2013 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+// +build appengine
+
+package cloudsql
+
+import (
+	"net"
+
+	"appengine/cloudsql"
+)
+
+func connect(instance string) (net.Conn, error) {
+	return cloudsql.Dial(instance)
+}

vendor/google.golang.org/appengine/cloudsql/cloudsql_vm.go

@@ -0,0 +1,16 @@
+// Copyright 2013 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+
+package cloudsql
+
+import (
+	"errors"
+	"net"
+)
+
+func connect(instance string) (net.Conn, error) {
+	return nil, errors.New(`cloudsql: not supported in App Engine "flexible environment"`)
+}