slapos_jio_ui_test: Added test for service worker

  It was added as "0" in order to run first, as the later tests calls logout and can be started as anonymous.
2 jobs for feat/testcase-more-retry in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:26:14

passed SlapOS.Eggs.UnitTest-Master.Python3

00:28:02