Fix "Follow up "slapos_cloud: Introduce SlapOSCacheMixin"

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

01:31:24

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:27

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:04