Relax dep on haskell-network
Relax dep on haskell-network

ganeti builds fine with network 2.8.

Signed-off-by: Apollon Oikonomopoulos <ed81ed0a45ccd5c8869bda52e38353a6299ee39e@debian.org>

mbakke/ganeti,ganeti/ganeti,mbakke/ganeti,ganeti/ganeti,mbakke/ganeti,ganeti/ganeti