manage Asterisk full log

[Stell0]

Asterisk full log is saved in the container.

• It should be ok to keep it there and loose it at container restart
• It should be rotated

edit: Requirements changed: now it isn't clear if we should keep the file. I' moving this again in the "no milestone" stack

edit 2: went back to old requisites. After the final release, if it is necessary to save the full we'll think of something