Merge branch 'fix-old-migration-repos-path-key' into 'master'

Update references to deprecated `repos_path` configuration key to avoid

## What does this MR do?

Update references to deprecated `repos_path` configuration key to avoid errors when updating GitLab from older versions

## Why was this MR needed?

Users were reporting errors when upgrading from GitLab 6.7

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1464

See merge request !6350

db/migrate/20140502125220_migrate_repo_size.rb

 # rubocop:disable all
 class MigrateRepoSize < ActiveRecord::Migration
+  DOWNTIME = false
+
   def up
     project_data = execute('SELECT projects.id, namespaces.path AS namespace_path, projects.path AS project_path FROM projects LEFT JOIN namespaces ON projects.namespace_id = namespaces.id')
 
     project_data.each do |project|
       id = project['id']
       namespace_path = project['namespace_path'] || ''
-      path = File.join(Gitlab.config.gitlab_shell.repos_path, namespace_path, project['project_path'] + '.git')
+      repos_path = Gitlab.config.gitlab_shell['repos_path'] || Gitlab.config.repositories.storages.default
+      path = File.join(repos_path, namespace_path, project['project_path'] + '.git')
 
       begin
         repo = Gitlab::Git::Repository.new(path)

lib/gitlab/import_export/repo_restorer.rb

@@ -22,10 +22,6 @@ module Gitlab
 
       private
 
-      def repos_path
-        Gitlab.config.gitlab_shell.repos_path
-      end
-
       def path_to_repo
         @project.repository.path_to_repo
       end