test/test_collect: fix some timezone dependent tests

See merge request !326
3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

01:16:36

passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:18

passed SlapOS.Eggs.UnitTest-Master.Python3

00:22:30