Add fog-aliyun as backup storage provider

Gemfile

@@ -97,6 +97,7 @@ gem 'fog-google', '~> 0.5'
 gem 'fog-local', '~> 0.3'
 gem 'fog-openstack', '~> 0.1'
 gem 'fog-rackspace', '~> 0.1.1'
+gem 'fog-aliyun', '~> 0.1.0'
 
 # for Google storage
 gem 'google-api-client', '~> 0.8.6'

Gemfile.lock

@@ -213,6 +213,11 @@ GEM
     flowdock (0.7.1)
       httparty (~> 0.7)
       multi_json
+    fog-aliyun (0.1.0)
+      fog-core (~> 1.27)
+      fog-json (~> 1.0)
+      ipaddress (~> 0.8)
+      xml-simple (~> 1.1)
     fog-aws (0.13.0)
       fog-core (~> 1.38)
       fog-json (~> 1.0)
@@ -913,6 +918,7 @@ DEPENDENCIES
   flay (~> 2.8.0)
   flipper (~> 0.10.2)
   flipper-active_record (~> 0.10.2)
+  fog-aliyun (~> 0.1.0)
   fog-aws (~> 0.9)
   fog-core (~> 1.44)
   fog-google (~> 0.5)

changelogs/unreleased/aliyun-backup-provider.yml

+---
+title: Add Aliyun OSS as the backup storage provider
+merge_request: 9721
+author: Yuanfei Zhu

doc/raketasks/backup_restore.md

@@ -133,7 +133,7 @@ It uses the [Fog library](http://fog.io/) to perform the upload.
 In the example below we use Amazon S3 for storage, but Fog also lets you use
 [other storage providers](http://fog.io/storage/). GitLab
 [imports cloud drivers](https://gitlab.com/gitlab-org/gitlab-ce/blob/30f5b9a5b711b46f1065baf755e413ceced5646b/Gemfile#L88)
-for AWS, Google, OpenStack Swift and Rackspace as well. A local driver is
+for AWS, Google, OpenStack Swift, Rackspace and Aliyun as well. A local driver is
 [also available](#uploading-to-locally-mounted-shares).
 
 For omnibus packages, add the following to `/etc/gitlab/gitlab.rb`: