slapos/grid: improve logging regarding networkcache

4 jobs for master in 0 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

03:35:41

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:46

passed SlapOS.Eggs.UnitTest-Master.Python3

00:20:05

failed SlapOS-Master.UnitTest-Master

02:34:39