Revert "Merge pull request #305 from frtos-wpan/pull-verbosity"

This reverts commit 231e77211804af53c69c5321cdcd962d58389a3f, reversing
changes made to e13d69cf41ee82e48a89ed530306cbd4991695ea.
Merge pull request #308 from adamdunkels/revert/verbosity

Revert "Merge pull request #305 from frtos-wpan/pull-verbosity"