VPP-659 TCP improvements

- builtin test echo server
- fix SYN-ACK retransmit canceling
- avoid sending spurious ACK if in LAST_ACK
- improved client dummy test app
- renamed tx fifo dequeuing and sending functions to avoid confusion
- improved RST handling

Change-Id: Ia14aad3df319540dcf6e6a4e18a9f8d423a4b83b
Signed-off-by: Florin Coras <fcoras@cisco.com>
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/vnet/unix/tapcli.c b/src/vnet/unix/tapcli.c
index 496f388..fb1a8ba 100644
--- a/src/vnet/unix/tapcli.c
+++ b/src/vnet/unix/tapcli.c
@@ -1435,7 +1435,8 @@
 
 VLIB_CLI_COMMAND (tap_connect_command, static) = {
     .path = "tap connect",
-    .short_help = "tap connect <intfc-name> [hwaddr <addr>]",
+    .short_help =
+	"tap connect <intfc-name> [address <ip-addr>/mw] [hwaddr <addr>]",
     .function = tap_connect_command_fn,
 };