Sort issues by creation date in Bitbucket importer

API reference here: https://bitbucket.org/site/master/issues/3571/api-issues-sorting-bb-3518

Closes https://github.com/gitlabhq/gitlabhq/issues/9519

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.0.0 (unreleased)
   - Prevent anchors from being hidden by header (Stan Hu)
+  - Sort issues by creation date in Bitbucket importer (Stan Hu)
   - Upgrade gitlab_git to 7.2.15 to fix `git blame` errors with ISO-encoded files (Stan Hu)
   - Prevent too many redirects upon login when home page URL is set to external_url (Stan Hu)
   - Improve dropdown positioning on the project home page (Hannes Rosenögger)

lib/gitlab/bitbucket_import/client.rb

@@ -52,7 +52,7 @@ module Gitlab
       end
 
       def issues(project_identifier)
-        JSON.parse(get("/api/1.0/repositories/#{project_identifier}/issues").body)
+        JSON.parse(get("/api/1.0/repositories/#{project_identifier}/issues?sort=utc_created_on").body)
       end
 
       def issue_comments(project_identifier, issue_id)