SQLiteAdapter adds autoincrement to integer column when changing primary key

[MasterOdin]

If I do:

        $this->table('foo')
            ->addColumn('id_2', 'integer')
            ->create();

        $this->table('foo')
            ->changePrimaryKey('id_2')
            ->update();

After the create I'll have:

CREATE TABLE `foo` (`id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, `id_2` INTEGER NULL);

and after the update I'll have:

CREATE TABLE IF NOT EXISTS "foo" (`id` INTEGER NOT NULL, `id_2` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT);

where even though didn't specify it, id_2 now has AUTOINCREMENT because it's an integer column. None of the other adapters does this, and it doesn't make sense that sqlite does either.

[dereuromark]

Solved in https://github.com/cakephp/migrations/pull/954 for Migrations. Feel free to port, seems like an important fix.