mojo: Fix testcases again.

The backend/client split this is all leading towards now makes it more
complicated to bring up the application. But then, that also should make
it possible to do better unit testing on each phase of start (reading
cmdline options, setting build context, creating the build plan, etc.).
2 jobs for make_it_mojo in 1 minute and 33 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #16229
smoke-test

00:01:32

passed #16228
unit-test

00:00:44