caucase.http: Do not risk modifying dictionary during iteration.

Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-Master.Python2

00:10:45

failed SlapOS.Eggs.UnitTest-Master.Python3

00:17:53

passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:45

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:55