Merge branch 'increase_lfs_size_column' into 'master'

Increase LFS objects size column

Fixes #12745

Increases the `size` column integer limit to an 8-byte integer. This allows for a max value of `9223372036854775807` which is 9,223,372,036 GB. That should do it 😃

I tested this by first reproducing the error (push a file larger than 2.1 GB). The error was:

```
RangeError (3145728000 is out of range for ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Integer with limit 4):
  lib/gitlab/lfs/response.rb:232:in `store_file'
  lib/gitlab/lfs/response.rb:170:in `render_lfs_upload_ok'
  lib/gitlab/lfs/response.rb:51:in `block in render_storage_upload_store_response'
  lib/gitlab/lfs/response.rb:204:in `render_response_to_push'
  lib/gitlab/lfs/response.rb:50:in `render_storage_upload_store_response'
  lib/gitlab/lfs/router.rb:76:in `put_response'
  lib/gitlab/lfs/router.rb:20:in `try_call'
  lib/gitlab/backend/grack_auth.rb:41:in `call'
  lib/gitlab/backend/grack_auth.rb:18:in `call_with_kerberos_support'
  lib/gitlab/backend/grack_auth.rb:8:in `call'
```

Then I ran this migration and pushed the file again. It uploaded successfully.

See merge request !2644

CHANGELOG

@@ -1,6 +1,8 @@
 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.4.3
+  - Increase lfs_objects size column to 8-byte integer to allow files larger
+    than 2.1GB
   - Correctly highlight MR diff when MR has merge conflicts
   - Fix highlighting in blame view
   - Update sentry-raven gem to prevent "Not a git repository" console output

db/migrate/20160128233227_change_lfs_objects_size_column.rb

@@ -0,0 +1,5 @@
+class ChangeLfsObjectsSizeColumn < ActiveRecord::Migration
+  def change
+    change_column :lfs_objects, :size, :integer, limit: 8
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160120172143) do
+ActiveRecord::Schema.define(version: 20160128233227) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -447,8 +447,8 @@
   add_index "labels", ["project_id"], name: "index_labels_on_project_id", using: :btree
 
   create_table "lfs_objects", force: :cascade do |t|
-    t.string   "oid",        null: false
-    t.integer  "size",       null: false
+    t.string   "oid",                  null: false
+    t.integer  "size",       limit: 8, null: false
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "file"