[MEDIUM] stream_interface: added a DISconnected state between CON/EST and CLO

There were rare situations where it was not easy to detect that a failed
session attempt had occurred and needed some server cleanup. In particular,
client aborts sometimes lead to session leaks on the server side.

A new state "SI_ST_DIS" (disconnected) has been introduced for this. When
a session has been closed at a stream interface but the server cleanup has
not occurred, this state is entered instead of CLO. The cleanup is then
performed there and the state goes to CLO.

A new diagram has been added to show possible stream_interface state
transitions that can occur in a stream-sock. It makes debugging easier.
diff --git a/doc/internals/stream-sock-states.fig b/doc/internals/stream-sock-states.fig
new file mode 100644
index 0000000..6380336
--- /dev/null
+++ b/doc/internals/stream-sock-states.fig
@@ -0,0 +1,417 @@
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+4 0 0 50 -1 14 6 0.0000 4 90 2880 4500 1710 ASS-CON: ssui(): connect_server() == SN_ERR_NONE\001
+4 0 0 50 -1 14 6 0.0000 4 75 540 4500 1350 INI-REQ: \001
+4 0 0 50 -1 14 6 0.0000 4 90 3720 4500 1530 REQ-ASS: prepare_conn_request(): srv_redispatch_connect() == 0\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 2475 2700 4\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 1620 4500 6\001
+4 0 0 50 -1 14 6 0.0000 4 90 3360 4500 1890 CON-EST: sess_update_st_con_tcp(): !timeout && !conn_err\001
+4 0 0 50 -1 14 6 0.0000 4 90 2460 4500 3510 TAR-ASS: ssui(): SI_FL_EXP && SN_ASSIGNED\001
+4 0 0 50 -1 14 6 0.0000 4 90 3420 4500 2970 ASS-REQ: connect_server: conn_retries == 0 && PR_O_REDISP\001
+4 0 0 50 -1 14 6 0.0000 4 90 2460 4500 2610 QUE-REQ: ssui(): !pend_pos && SN_ASSIGNED\001
+4 0 0 50 -1 14 6 0.0000 4 90 2520 4500 2790 QUE-REQ: ssui(): !pend_pos && !SN_ASSIGNED\001
+4 0 0 50 -1 14 6 0.0000 4 90 3300 4500 4230 QUE-CLO: ssui(): pend_pos && (SI_FL_EXP || req_aborted)\001
+4 0 0 50 -1 14 6 0.0000 4 90 2520 4500 3690 TAR-REQ: ssui(): SI_FL_EXP && !SN_ASSIGNED\001
+4 0 0 50 -1 14 6 0.0000 4 90 3960 4500 4545 ASS-CLO: PR_O_REDISP && SN_REDIRECTABLE && perform_http_redirect()\001
+4 0 0 50 -1 14 6 0.0000 4 90 4440 4500 2430 REQ-QUE: prepare_conn_request(): srv_redispatch_connect() != 0 (SI_ST_QUE)\001
+4 0 0 50 -1 14 6 0.0000 4 90 4200 4500 4050 REQ-CLO: prepare_conn_request(): srv_redispatch_connect() != 0 (error)\001
+4 0 0 50 -1 14 6 0.0000 4 90 4320 4500 4410 ASS-CLO: ssui(): connect_server() == SN_ERR_INTERNAL || conn_retries < 0\001
+4 0 0 50 -1 14 6 0.0000 4 90 3120 4500 4680 CON-CER: sess_update_st_con_tcp(): timeout/SI_FL_ERR\001
+4 0 0 50 -1 14 6 0.0000 4 90 3600 4500 4860 CER-CLO: sess_update_st_cer(): (ERR/EXP) && conn_retries < 0\001
+4 0 0 50 -1 14 6 0.0000 4 90 4200 4500 3870 CER-REQ: sess_update_st_cer(): timeout && !conn_retries && PR_O_REDISP\001
+4 0 0 50 -1 14 6 0.0000 4 90 3600 4500 3330 CER-TAR: sess_update_st_cer(): conn_err && conn_retries >= 0\001
+4 0 0 50 -1 14 6 0.0000 4 90 4620 4500 3150 CER-ASS: sess_update_st_cer(): timeout && (conn_retries >= 0 || !PR_O_REDISP)\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 1305 3375 3\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 2430 4500 7\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 2430 3600 5\001
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+4 0 4 50 -1 14 10 0.0000 4 105 90 2430 5310 8\001
+4 0 0 50 -1 14 6 0.0000 4 90 3000 4500 2070 EST-DIS: stream_sock_read/write/shutr/shutw: close\001
+4 0 0 50 -1 14 6 0.0000 4 90 1980 4500 2250 EST-DIS: process_session(): error\001
+4 0 0 50 -1 14 6 0.0000 4 90 2100 4500 5040 DIS-CLO: process_session(): cleanup\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 5490 DIS\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 1350 4680 CER\001
+4 1 0 50 -1 14 10 0.0000 4 105 270 2250 1980 REQ\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 1125 3555 TAR\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 2880 ASS\001
+4 1 0 50 -1 14 10 0.0000 4 105 270 3375 2430 QUE\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 3780 CON\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 4680 EST\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 6255 CLO\001
+4 1 0 50 -1 14 10 0.0000 4 90 270 2250 1080 INI\001
+4 0 0 50 -1 14 6 0.0000 4 90 2820 4500 5220 TAR-CLO: sess_update_stream_int(): client abort\001
+4 0 4 50 -1 14 10 0.0000 4 105 90 2385 6075 9\001
+4 0 0 50 -1 16 6 0.0000 4 120 5970 675 6885 Note: states painted yellow above are transient ; process_session() will never leave a stream interface in any of those upon return.\001
+4 0 0 50 -1 14 6 0.0000 4 90 2820 4500 5400 CON-DIS: sess_update_st_con_tcp(): client abort\001
+4 1 0 50 -1 14 8 0.0000 4 15 75 5130 5985 -\001
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+4 1 0 50 -1 14 8 0.0000 4 75 225 6930 5760 CON\001
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