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pespin uploaded patch set #7 to this change.

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asp: Support Tx DAUD when ASP becomes activated

Otherwise the local Signalling Point has no way to know whether the
remote Signalling Points it wants to talk to are actually already
connected to the STP when it becomes active after the process starts
up, unless it attempts to transmit a message to it.
This pocedure is documented both for M3UA and SUA:
* RFC4666 4.6, RFC3868 4.6
* RFC4666 4.5.3, RFC3868 4.5.3 "ASP Auditing"
* RFC4666 5.5.1.1.3 "Support for ASP Querying of SS7 Destination States"

The M3UA specs (RFC4666 5.5.1.1.3) explicitly state that the point codes to audit are not
to be provided by uppers layers, so picking the ones from the locally
configured address book for now:
"""
Note: there is no primitive for the
MTP3-User to request this audit from the M3UA layer, as this is
initiated by an internal M3UA management function.
"""

This is not enabled by default since it's optional according to specs,
and some SGs may actually return errors (it's possible according to
RFC4666 to deny access to auditing by the SG).

Related: OS#5917
Related: SYS#7501
Change-Id: I7c8c5099d4d00ea6f4a8db59ed6b833fb0ffa43d
---
M src/ss7_asp.h
M src/ss7_asp_vty.c
M src/xua_asp_fsm.c
M tests/vty/osmo_stp_test.vty
4 files changed, 120 insertions(+), 17 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-sigtran refs/changes/01/40501/7

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Gerrit-MessageType: newpatchset
Gerrit-Project: libosmo-sigtran
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Gerrit-Change-Id: I7c8c5099d4d00ea6f4a8db59ed6b833fb0ffa43d
Gerrit-Change-Number: 40501
Gerrit-PatchSet: 7
Gerrit-Owner: pespin <pespin@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <vyanitskiy@sysmocom.de>
Gerrit-Reviewer: laforge <laforge@osmocom.org>
Gerrit-Reviewer: osmith <osmith@sysmocom.de>
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