caucase.test: Remove coverage expectation on a few code paths.

4 branches depend on how tests are written, and are indeed not currently
used.
1 branch depend on test process environment.
4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-Master.Python2

00:19:12

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:42

passed SlapOS.Eggs.UnitTest-Master.Python2

00:21:25

passed SlapOS.Eggs.UnitTest-Master.Python3

00:33:34