[M] Change in libosmo-sigtran[master]: sua: Do SUA specific SNM msg validation

pespin has posted comments on this change by pespin. ( https://gerrit.osmocom.org/c/libosmo-sigtran/+/43399?usp=email )

Change subject: sua: Do SUA specific SNM msg validation ......................................................................

Patch Set 1: Code-Review-2

(1 comment)

Patchset:

PS1: TODO: I still need to add:

* SUA ASP ACT has extra: TID Label Optional DRN Label Optional

* Check differences in SUA vs M3UA on "[SUA_MSGC_RKM] = &m3ua_msg_class_rkm,"