Session layer refactoring

Major refactoring of the session layer api
- Add attatch api for application binding to the the session layer
- Simplify listen/connect calls
- Update application CLI
- Add transport endpoint to accept callback
- Associate segment manager to application and allow for multiple
  binds/connects per app

Additional:
- svm fifo cleanup
- add fifo free, format fns
- add fifo offset enqueue unit test

Change-Id: Id93a65047de61afc2bf3d58c9b544339c02065af
Signed-off-by: Florin Coras <fcoras@cisco.com>
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vnet/tcp/builtin_client.h b/src/vnet/tcp/builtin_client.h
index 6403030..2bd87c0 100644
--- a/src/vnet/tcp/builtin_client.h
+++ b/src/vnet/tcp/builtin_client.h
@@ -39,8 +39,7 @@
   svm_fifo_t *server_rx_fifo;
   svm_fifo_t *server_tx_fifo;
 
-  u32 vpp_session_index;
-  u32 vpp_session_thread;
+  u64 vpp_session_handle;
 } session_t;
 
 typedef struct
@@ -110,6 +109,10 @@
   u32 client_bytes_received;
   u8 test_return_packets;
 
+  u8 is_init;
+
+  u32 node_index;
+
   /* convenience */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;