stack/slapos: version up slapos.core 1.7.5

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

00:10:51

passed SlapOS.Eggs.UnitTest-Master.Python2

00:21:16

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:59

passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:24

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:43:59