Configure logs for testing

[AMS777]

Currently the logs show the same environment on production, testing or local. Log example:

[2018-03-27 17:12:29] production.ERROR: ErrorException:

The idea is that if a log is written during testing, the environment changes:

[2018-03-27 17:12:29] testing.ERROR: ErrorException:

[AMS777]

Use log config file:

https://github.com/laravel/lumen-framework/tree/5.6/config