Merge branch 'remove-backup-strategies' into 'master'

Stop supporting Google Cloud and Azure as backup strategies

## What does this MR do?

It removes support for Azure and Google Cloud as backup strategies (via Fog).

Motivation behind this decision can be found in !4928, !6713 but basically they require a lot of gems that are unrelated to the backup use-case.

## Are there points in the code the reviewer needs to double check?

Am I missing any other location where we'd use these gems?

See merge request !7739

Gemfile

@@ -85,10 +85,8 @@ gem 'dropzonejs-rails', '~> 0.7.1'
 
 # for backups
 gem 'fog-aws', '~> 0.9'
-gem 'fog-azure', '~> 0.0'
 gem 'fog-core', '~> 1.40'
 gem 'fog-local', '~> 0.3'
-gem 'fog-google', '~> 0.3'
 gem 'fog-openstack', '~> 0.1'
 gem 'fog-rackspace', '~> 0.1.1'
 

Gemfile.lock

@@ -66,21 +66,6 @@ GEM
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    azure (0.7.5)
-      addressable (~> 2.3)
-      azure-core (~> 0.1)
-      faraday (~> 0.9)
-      faraday_middleware (~> 0.10)
-      json (~> 1.8)
-      mime-types (>= 1, < 3.0)
-      nokogiri (~> 1.6)
-      systemu (~> 2.6)
-      thor (~> 0.19)
-      uuid (~> 2.0)
-    azure-core (0.1.2)
-      faraday (~> 0.9)
-      faraday_middleware (~> 0.10)
-      nokogiri (~> 1.6)
     babel-source (5.8.35)
     babel-transpiler (0.7.0)
       babel-source (>= 4.0, < 6)
@@ -217,19 +202,10 @@ GEM
       fog-json (~> 1.0)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-azure (0.0.2)
-      azure (~> 0.6)
-      fog-core (~> 1.27)
-      fog-json (~> 1.0)
-      fog-xml (~> 0.1)
     fog-core (1.42.0)
       builder
       excon (~> 0.49)
       formatador (~> 0.2)
-    fog-google (0.3.2)
-      fog-core
-      fog-json
-      fog-xml
     fog-json (1.0.2)
       fog-core (~> 1.0)
       multi_json (~> 1.10)
@@ -397,8 +373,6 @@ GEM
       rb-inotify (>= 0.9)
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
-    macaddr (1.7.1)
-      systemu (~> 2.6.2)
     mail (2.6.4)
       mime-types (>= 1.16, < 4)
     mail_room (0.9.0)
@@ -728,7 +702,6 @@ GEM
     sys-filesystem (1.1.6)
       ffi
     sysexits (1.2.0)
-    systemu (2.6.5)
     teaspoon (1.1.5)
       railties (>= 3.2.5, < 6)
     teaspoon-jasmine (2.2.0)
@@ -768,8 +741,6 @@ GEM
       get_process_mem (~> 0)
       unicorn (>= 4, < 6)
     uniform_notifier (1.10.0)
-    uuid (2.3.8)
-      macaddr (~> 1.0)
     version_sorter (2.1.0)
     virtus (1.0.5)
       axiom-types (~> 0.1)
@@ -849,9 +820,7 @@ DEPENDENCIES
   ffaker (~> 2.0.0)
   flay (~> 2.6.1)
   fog-aws (~> 0.9)
-  fog-azure (~> 0.0)
   fog-core (~> 1.40)
-  fog-google (~> 0.3)
   fog-local (~> 0.3)
   fog-openstack (~> 0.1)
   fog-rackspace (~> 0.1.1)

changelogs/unreleased/remove-backup-strategies.yml

+---
+title: Stop supporting Google and Azure as backup strategies
+merge_request: 
+author: 

doc/raketasks/backup_restore.md

@@ -88,7 +88,7 @@ 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, Azure, Google, OpenStack Swift and Rackspace as well. A local driver is
+for AWS, OpenStack Swift and Rackspace as well. A local driver is
 [also available](#uploading-to-locally-mounted-shares).
 
 For omnibus packages: