fix if empty tag
make scherch list as uniq
added model proc E5-2630 core counts
treat unknown as None
display model instead of model group
Disable deployment plugin reboot
Merge pull request #583 from wmatyskiewicz/bugs

Bugs
Merge pull request #584 from deshipu/master

fix xen disk discovery
DonPedro bugfix - 'ipaddress' KeyError iterate through ethernets
Merge pull request #585 from quamilek/bugfix

DonPedro bugfix - 'ipaddress' KeyError iterate through ethernets
Added new Xeon processor into the list.
Merge pull request #590 from vi4m/master

Fixed Xeon processor to have 8 cores
Merge branch 'master' of github.com:allegro/ralph
Dosc for the ganeti plugin