Expose more data on the SystemHooks API

 Now exposed:
 - push_events
 - tag_push_events
 - enable_ssl_verification
 - token

 Fixes gitlab-org/gitlab-ce#23307

lib/api/entities.rb

@@ -43,14 +43,13 @@ module API
     end
 
     class Hook < Grape::Entity
-      expose :id, :url, :created_at
+      expose :id, :url, :created_at, :push_events, :tag_push_events
+      expose :enable_ssl_verification, :token
     end
 
     class ProjectHook < Hook
-      expose :project_id, :push_events
-      expose :issues_events, :merge_requests_events, :tag_push_events
+      expose :project_id, :issues_events, :merge_requests_events
       expose :note_events, :build_events, :pipeline_events, :wiki_page_events
-      expose :enable_ssl_verification
     end
 
     class BasicProjectDetails < Grape::Entity