Change in osmo-bsc[master]: fix gscon clear 3/n: separate state for SCCP RLSD

[neels]

Hello Jenkins Builder, laforge, pespin, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/osmo-bsc/+/26614

to look at the new patch set (#2).

Change subject: fix gscon clear 3/n: separate state for SCCP RLSD
......................................................................

fix gscon clear 3/n: separate state for SCCP RLSD

Properly implement the separate conn release stages in separate FSM
states:

x) sent Clear Request, wait for a Clear Command from the MSC.
   Timeout after a configurable 60s.

y) after a Clear Command and sending a Clear Complete, wait for the SCCP
   RLSD. Timeout after a configurable 60s.

z) terminate after the RLSD is received / after timeout.

handover_test.c needs a little tweak to make the MGCP release work with
its fake MGCP client, because cleanup now ensures to invoke
gscon_forget_mgw_endpoint() in all cases.

Related: I680ec4ed866aa5f0b1ff29e7e98322615cfb288d (osmo-ttcn3-hacks)
Related: OS#5337
Change-Id: Ie975117d37f38ba853589dc7f8d3e94f8f9586b2
---
M src/osmo-bsc/bsc_subscr_conn_fsm.c
M tests/handover/handover_test.c
2 files changed, 75 insertions(+), 54 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/14/26614/2
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: Ie975117d37f38ba853589dc7f8d3e94f8f9586b2
Gerrit-Change-Number: 26614
Gerrit-PatchSet: 2
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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