Evgeny
028768c53a
etcp_router: add congestion counters, fix tx_seq rollback on etcp_send failure, add router metrics to etcpmon GUI
- etcp_router.h: add 9 per-conn counters (pkts_sent/err/rcvd, ack_sent/recv/stale, dup/oob/sign_fail)
- etcp_router.c: increment counters at 13 event points; fix tx_seq rollback on etcp_send failure (was causing phantom inflight=256 deadlock); add DEBUG_ERROR on all 5 ignored etcp_send returns; fix router_ack_do_send to update timestamps only on success
- etcpmon_protocol.h: add etcpmon_router_metrics (14 aggregated fields)
- control_server.c: iterate router_conns to fill aggregated router metrics
- etcpmon_gui: new 'Router Congestion' block with queue depths and all counters, Debug Levels shifted down, window 1300->1440
- test_etcp_router_unit: fix test_ack_timer for correct no-BGP-route behavior