BSSMAP RESET: move cancel-paging call to osmo_bsc_sigtran_reset()

So far we would cancel ongoing Paging for a given MSC only after receiving a
RESET message from that BSC. However, the typical operation would be that
OsmoBSC *sends* a RESET and receives a RESET-ACK.

Instead, move the call to within osmo_bsc_sigtran_reset(). This is also called
when OsmoBSC considers the A-interface link to be lost, from the a_reset.c
code, after multiple SCCP connection failures.

Change-Id: Ia14b916be56563d18632c69a833084e71799a468
3 files changed