Lost logging support for django management commands

[Celso Providelo]

Since r3571 [1] we have lost logging support in django management commands, messages are simple swallowed by the module.

The rationale for removing django logging configuration was because we were moving the webapp to talisker, which provides properly configured logging.

Talisker also offers a runner for standalone scripts (`talisker.run`), but that's not available in the revision used by SCA. So, to continue in this path, we would have to upgrade talisker, rollout and make sure there are no regressions, then come back to the mgmt. actions and find a way wrap them with talisker runner (Makefile ?).

[1] https://code.launchpad.net/~ricardokirkner/software-center-agent/django-logging-no-more/+merge/310998