software/theia: Enable resiliency test with Python3

This reverts commit a42d199a.
6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:00

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:18

passed SlapOS.SlapRunner.ResilienceTest-Master

00:21:59

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:28:47

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

07:40:10

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

06:10:51