Add tests for evolver.yml configs that should be rejected.

[imaitland]

/ POST currently accepts a subtly wrong configs e.g.

• missing config wrapper, around a property, like hardware's calibrator, should be in hardware.config.calibrator, not hardware.calibrator.

Task

• Write a variety of mal-formed config objects.
• Write tests where assertions are made showing malformed configs are rejected when POST'd to / , with useful error messages, e.g. "missing config on classinfo".