erp5_web_renderjs_ui: Add minimal oauth2 token support.

This should evolve to become a browser-side OAuth2 client.
8 jobs for erp5_drone_simulator in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:19:07

passed ERP5.PerformanceTest-Master

00:27:50

failed ERP5.UnitTest-Master

03:01:23

failed ERP5.UnitTest-Master.Medusa

passed SlapOS.Eggs.UnitTest-Master.Python2

00:13:51

passed SlapOS.Eggs.UnitTest-Master.Python3

00:15:23

passed ERP5.CodingStyleTest-Master

failed ERP5.UnitTest-Master