docs: adding libvirt config

docs/install-node.rst

-Installation of a development node machine
-==========================================
-
-.. highlight:: bash
+-Installation of a development node machine
+-==========================================
+-
+-.. highlight:: bash
+-
 
 Preparation
 -----------
@@ -47,6 +48,12 @@ Change the libvirt default settings in */etc/libvirt/qemu.conf*::
 
 Setting up SSL certificates for migrations::
 
+  Add "-l" parameter to /etc/default/libvirt-bin at libvirtd-opts="-d -l"
+  
+  /etc/libvirt/libvirtd.conf
+  listen_tcp = 1
+  auth_tcp = "none"
+
   $ TODO
 
 Installing CIRCLE vmdriver