build-split-zone: write to correct directory

hooks/build-split-zone

@@ -41,9 +41,9 @@ template = Lxc::Template.new(template_path)
 serial = Time.new.to_i
 resolver = Resolver.new
 zones = [
-  ["zones/higgsboson.tk.zone", :pub],
-  ["zones/internal-eve.higgsboson.tk.zone", :eve],
-  ["zones/internal-eva.higgsboson.tk.zone", :eva],
+  [Lxc::CONFIG_ROOT.join("zones/higgsboson.tk.zone"), :pub],
+  [Lxc::CONFIG_ROOT.join("zones/internal-eve.higgsboson.tk.zone"), :eve],
+  [Lxc::CONFIG_ROOT.join("zones/internal-eva.higgsboson.tk.zone"), :eva],
 ]
 zones.each do |zone, type|
   template.write(zone, resolver: resolver, serial: serial, type: type)