devices: create dummy device-input node to keep nexts in sync

device-input feature arc requires that all input-nodes have
nexts in sync. packet-generator tends to call vlib_node_add_next
when new stream is created and that puts nexts out of sync.

With this change all input node are siblings of device-input
node so call to vlib_node_add_next(...) will install same next
to the whole family.

Change-Id: I33d79492e5f30f348af19e527f36fe0222c524d7
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/vnet/Makefile.am b/vnet/Makefile.am
index 185c08a..fef928a 100644
--- a/vnet/Makefile.am
+++ b/vnet/Makefile.am
@@ -31,6 +31,7 @@
 ########################################
 libvnet_la_SOURCES +=					\
   vnet/config.c						\
+  vnet/devices/devices.c				\
   vnet/handoff.c					\
   vnet/interface.c					\
   vnet/interface_cli.c					\
@@ -721,7 +722,6 @@
 ########################################
 
 libvnet_la_SOURCES +=				\
-  vnet/devices/feature.c			\
   vnet/feature/feature.c			\
   vnet/feature/registration.c