move interfaces.d to bottom

files/interfaces.j2

-source /etc/network/interfaces.d/*
+# MyCard NextGen Router config file
 
 # The loopback network interface
 auto lo
@@ -108,3 +108,7 @@ provider ppp{{ppp.id}}
 
 # end PPPs
 {% endif %}
+
+# end MyCard NextGen Router config file
+
+source /etc/network/interfaces.d/*