shell/caucase.sh: Make caucased verbose in tests.

Tests are supposed to help spot errors, and caucased access traces help
with this too.
2 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:34:09

failed SlapOS.Eggs.UnitTest-Master.Python3

00:07:44