slapos/testing: don't check bin/phantomjs in checkSoftware

5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS-Master.UnitTest-Master

02:06:39

failed SlapOS.Eggs.UnitTest-Master.Python2

00:25:33

failed SlapOS.Eggs.UnitTest-Master.Python3

00:39:34

passed SlapOS-Master.UnitTest-Master

03:05:19

failed SlapOS-Master.UnitTest-Master

03:10:18