Merge branch 'bitbucket-oauth2' into 'master'

Refactor Bitbucket importer to use BitBucket API Version 2

## What does this MR do?

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

## Why was this MR needed?

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/19946

## Screenshots (if relevant)

This MR needs the following permissions in the Bitbucket OAuth settings:

![image](/uploads/a26ae5e430a724bf581a92da7028ce3c/image.png)

- [] 

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5995

2 files changed, 6 insertions, 2 deletions

diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
index 26c30e523a7..ab5a0561b8c 100644
--- a/config/initializers/omniauth.rb
+++ b/config/initializers/omniauth.rb
@@ -26,3 +26,9 @@ if Gitlab.config.omniauth.enabled
     end
   end
 end
+
+module OmniAuth
+  module Strategies
+    autoload :Bitbucket, Rails.root.join('lib', 'omniauth', 'strategies', 'bitbucket')
+  end
+end
diff --git a/config/initializers/public_key.rb b/config/initializers/public_key.rb
deleted file mode 100644
index e4f09a2d020..00000000000
--- a/config/initializers/public_key.rb
+++ /dev/null
@@ -1,2 +0,0 @@
-path = File.expand_path("~/.ssh/bitbucket_rsa.pub")
-Gitlab::BitbucketImport.public_key = File.read(path) if File.exist?(path)