Required tests

Most of them are implemented in http://anonscm.debian.org/gitweb/?p=users/spaillard/qa-mirrors.git;a=summary, should be splitted in little modules and usable by nagios checks.

for each referenced mirror (and even the ones disabled, in order to check when they are available/fixed again), we should test :

for /debian/

for /debian-cd/

Bonus