[PATCH 0 of 2] mq/qqueue: enable renaming of active queue, v.2

[Yann E. MORIN]

Hello All!

This patch enables renaming of the active queue.

Chances since v.1:
- factor queuedir computation (Benoit)
- be consistent in utilities being called (Benoit)
- factor code to set active queue

Thank you!

Regards,
Yann E. MORIN.