Cabal: Allow attoparsec <= 0.12 and lens <= 4.3
Cabal: Allow attoparsec <= 0.12 and lens <= 4.3

Compilation was tested successfully.

Signed-off-by: Niklas Hambuechen <98215d3a72cb13cc9c9956528e50119ca7d1fb8b@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

onponomarev/ganeti,andir/ganeti,grnet/snf-ganeti,dimara/ganeti,apyrgio/ganeti,leshchevds/ganeti,grnet/snf-ganeti,yiannist/ganeti,mbakke/ganeti,andir/ganeti,bitemyapp/ganeti,leshchevds/ganeti,mbakke/ganeti,ganeti/ganeti,dimara/ganeti,yiannist/ganeti,yiannist/ganeti,andir/ganeti,mbakke/ganeti,leshchevds/ganeti,ganeti/ganeti,ganeti/ganeti,onponomarev/ganeti,bitemyapp/ganeti,apyrgio/ganeti