Add the gateway to hostonly network interfaces on Debian [GH-990]

lib/vagrant/action/vm/network.rb

@@ -259,9 +259,10 @@ module Vagrant
 
         def hostonly_network_config(config)
           return {
-            :type    => config[:type],
-            :ip      => config[:ip],
-            :netmask => config[:netmask]
+            :type       => config[:type],
+            :adapter_ip => config[:adapter_ip],
+            :ip         => config[:ip],
+            :netmask    => config[:netmask]
           }
         end
 

templates/guests/debian/network_static.erb

@@ -4,4 +4,5 @@ auto eth<%= options[:interface] %>
 iface eth<%= options[:interface] %> inet static
       address <%= options[:ip] %>
       netmask <%= options[:netmask] %>
+      gateway <%= options[:adapter_ip] %>
 #VAGRANT-END