Merge branch 'rails5-route-warnings' into 'master'

Fix route deprecation warnings in rails 5

See merge request gitlab-org/gitlab-ce!21684

config/routes.rb

@@ -31,7 +31,7 @@ Rails.application.routes.draw do
   # Having a non-existent controller here does not affect the scope in any way since all possible routes
   # get a 404 proc returned. It is written in this way to minimize merge conflicts with EE
   scope path: '/login/oauth', controller: 'oauth/jira/authorizations', as: :oauth_jira do
-    match ':action', via: [:get, :post], to: proc { [404, {}, ['']] }
+    match '*all', via: [:get, :post], to: proc { [404, {}, ['']] }
   end
 
   use_doorkeeper_openid_connect

config/routes/project.rb

@@ -145,7 +145,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      controller 'merge_requests/creations', path: 'merge_requests' do
+      scope path: 'merge_requests', controller: 'merge_requests/creations' do
         post '', action: :create, as: nil
 
         scope path: 'new', as: :new_merge_request do