Turn off VT-x and limit to 1 CPU

tests/Vagrantfile

@@ -13,8 +13,15 @@ Vagrant.configure(2) do |config|
   config.vm.define "vsrx" do |vsrx|
       vsrx.vm.hostname = "vsrx"
       vsrx.vm.box = "juniper/ffp-12.1X47-D15.4-packetmode"
+
+      vsrx.vm.provider :virtualbox do |vb|
+        vb.customize ["modifyvm", :id, "--hwvirtex", "off"]
+        vb.cpus = 1
+      end
   end
 
+
+
   config.vm.provision "ansible" do |ansible|
       ansible.groups = {
           "all" => ["vsrx"]