Merge branch '12622-backup-restore-doesn-t-clear-cache-resulting-in-missing-branches-and-tags' into 'master'

Fix: Backup restore doesn't clear cache

## What does this MR do?

Clears cache when we do backup restoring. Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/12622



## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/12622

See merge request !7019

CHANGELOG.md

@@ -5,6 +5,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Trim leading and trailing whitespace on project_path (Linus Thiel)
   - Fix HipChat notifications rendering (airatshigapov, eisnerd)
   - Simpler arguments passed to named_route on toggle_award_url helper method
+  - Fix: Backup restore doesn't clear cache
 
 ## 8.13.0 (2016-10-22)
 

lib/tasks/gitlab/backup.rake

@@ -51,6 +51,7 @@ namespace :gitlab do
         $progress.puts 'done'.color(:green)
         Rake::Task['gitlab:backup:db:restore'].invoke
       end
+
       Rake::Task['gitlab:backup:repo:restore'].invoke unless backup.skipped?('repositories')
       Rake::Task['gitlab:backup:uploads:restore'].invoke unless backup.skipped?('uploads')
       Rake::Task['gitlab:backup:builds:restore'].invoke unless backup.skipped?('builds')
@@ -58,6 +59,7 @@ namespace :gitlab do
       Rake::Task['gitlab:backup:lfs:restore'].invoke unless backup.skipped?('lfs')
       Rake::Task['gitlab:backup:registry:restore'].invoke unless backup.skipped?('registry')
       Rake::Task['gitlab:shell:setup'].invoke
+      Rake::Task['cache:clear'].invoke
 
       backup.cleanup
     end