This patch makes use of the newly introduced sbcap library, and
introduces new code (and extends existing one) to handle all the aspects
of MME peers talking SBc-AP and its underlaying SCTP connection.
This commit doesn't aim to implement all the SBc-AP features, but to
implement a minimal subset of features already available for CBSP in
osmo-cbc, in order to have similar support level for both 2G and 4G
networks.
Related: OS#4945
Change-Id: Ib278bc1d1a74459814016fef7a8fe21cc29d46c9
So far we couldn't depend on proper versions as they had not been
released yet. Now they do, so we can add the respective dependencies
Change-Id: I0573a151f55488599a01ea9dfdcfa02396cd6c35
We don't want osmo-cbc to depend on python3 at runtime, so let's use
a sub-package for osmo-cbc-apitool.py
Change-Id: Id16613811993a2baa06ebc2da6c6591ace70a3f9