Changing the unique paramater from True to False has no effect on MySQL

[Vadim]

Steps to reproduce:

1. Create a model:

from django.db import models

class TestModel(models.Model):
    name = models.CharField(max_length=100, unique=True)
    surname = models.CharField(max_length=50)

2. makemigrations && migrate

$ ./manage.py sqlmigrate testapp 0001_initial
BEGIN;
CREATE TABLE `testapp_testmodel` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(100) NOT NULL UNIQUE, `surname` varchar(50) NOT NULL);

COMMIT;

$ cat testapp/migrations/0001_initial.py
# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [ 
    ]   

    operations = [ 
        migrations.CreateModel(
            name='TestModel',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('name', models.CharField(unique=True, max_length=100)),
                ('surname', models.CharField(max_length=50)),
            ],
        ),
    ] 

3. Set unique to False, makemigrations and migrate

from django.db import models

class TestModel(models.Model):
    name = models.CharField(max_length=100, unique=False)
    surname = models.CharField(max_length=50)

$ cat testapp/migrations/0002_auto_20161106_2004.py
# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('testapp', '0001_initial'),
    ]

    operations = [
        migrations.AlterField(
            model_name='testmodel',
            name='name',
            field=models.CharField(max_length=100),
        ),
    ]

$ ./manage.py sqlmigrate testapp 0002_auto_20161106_2004

mysql> show create table testapp_testmodel;
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table             | Create Table                                                                                                                                                                                                                         |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| testapp_testmodel | CREATE TABLE `testapp_testmodel` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) NOT NULL,
  `surname` varchar(50) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0,00 sec)

Notes:
It works well on SQLite
This bug also exists in 1.10