udp: use transport port refcnt on accept

Use udp transport refcnt instead of local port refcnt when accepting new
connections.

Type: fix

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Ibc34677b1138682497f98e96b6fddb5b96094ff9
diff --git a/src/vnet/udp/udp.h b/src/vnet/udp/udp.h
index 3dc116e..8e4e87f 100644
--- a/src/vnet/udp/udp.h
+++ b/src/vnet/udp/udp.h
@@ -205,6 +205,7 @@
 
 void udp_connection_free (udp_connection_t * uc);
 udp_connection_t *udp_connection_alloc (u32 thread_index);
+void udp_connection_share_port (u16 lcl_port, u8 is_ip4);
 
 always_inline udp_connection_t *
 udp_connection_clone_safe (u32 connection_index, u32 thread_index)