Automatic verbosity on the debug module

Currently, the debug module messages are not shown by ansible unless the user is using the verbose mode (the -v option). It would be nice that the verbosity was automatic on the debug module as @mpdehaan suggested in the chatroom.

A module could force the verbosity mode by passing an extra parameter to the ReturnData constructor. The runner could pass that option to callbacks.on_ok as a boolean, something like ignore_errors in the on_failed method. Thoughts?