Change in libosmocore[master]: GSUP: add inter-MSC handover related msgs and IEs

[osmith]

Hello Vadim Yanitskiy, daniel, Max, Neels Hofmeyr, Jenkins Builder, 

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

    https://gerrit.osmocom.org/12860

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

Change subject: GSUP: add inter-MSC handover related msgs and IEs
......................................................................

GSUP: add inter-MSC handover related msgs and IEs

Based on a draft created by Neels, which is the result of reading a MAP
trace of two MSCs negotiating inter-MSC handovers, and of reading the
TS 29.002, TS 29.010 and related specs:
https://lists.osmocom.org/pipermail/openbsc/2019-January/012653.html

I figured out that the "Handover Number" mentioned in the specifications
is the same as the MSISDN IE that we already have, so we can use that
instead of creating a new IE (example usage in tests/gsup/gsup_test.c).

Related: OS#3774
Change-Id: Ic00b0601eacff6d72927cea51767801142ee75db
---
M include/Makefile.am
M include/osmocom/gsm/gsup.h
A include/osmocom/gsm/gsup_handover.h
M src/gsm/Makefile.am
M src/gsm/gsup.c
A src/gsm/gsup_handover.c
M src/gsm/libosmogsm.map
M tests/gsup/gsup_test.c
M tests/gsup/gsup_test.err
M tests/gsup/gsup_test.ok
10 files changed, 608 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/60/12860/2
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ic00b0601eacff6d72927cea51767801142ee75db
Gerrit-Change-Number: 12860
Gerrit-PatchSet: 2
Gerrit-Owner: osmith <osmith at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder (1000002)
Gerrit-Reviewer: Max <msuraev at sysmocom.de>
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Vadim Yanitskiy <axilirator at gmail.com>
Gerrit-Reviewer: daniel <dwillmann at sysmocom.de>
Gerrit-Reviewer: osmith <osmith at sysmocom.de>
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