Improve openfisca cli

[bonjourmauko]

Job story

When I'm working with an openfisca country package,
I need openfisca test to work as expected,
So to validate the work I'm doing

TODO

• Restore line printing in tracer #1310
• Make the cli of openfisca test, testable #1312
• verbose option of openfisca test fails  #1293
• Make the test runner of openfisca test more resilient #1313
• Ensure that tracing max_depth works as expected with country-template #1311
• AttributeError 'NoneType' object has no attribute 'tracer' on tests and package mismatch #1213