[swift] Add firewall template per host, not device

Also strip /device from storage host names.

The firewall.pp template was appended to swift.pp per swift storage device, not
per host, which caused duplicate definitions when more than one device per host
was used.

Change-Id: If99ff4a6a73dfead5f72ff0b5dbc592b28ba5f6a
Fixes: rhbz#1072070, rhbz#1072099
Merge "[swift] Add firewall template per host, not device"