Changes

bts: rename g_next_meas_res_nr / g_first_meas_res

These variables are used by as_rsl_meas_res() to track MEASurement
RESult PDUs on the A-bis/RSL link.  Clarify their names.

Change-Id: Iceb58bb636817afcd0fdf1eb3344d03153860a56
Related: OS#6933

bts: as_rsl_meas_res(): move chan_est to ConnHdlr

Altstep local variables are reset when another altstep, executed
among with as_rsl_meas_res(), repeats.  Move the chan_est variable
to ConnHdlr, so that it does not get reset.

Change-Id: I3a31532494e123935fb2aede0e67e4271962ab5f
Related: OS#6933

bts: f_est_dchan(): also reset g_rsl_meas_res_nr

This avoids unexpected failures if a dedicated channel is
established more than once by ConnHdlr.

Change-Id: Ia26413339c8c056e21661ae29bb2618b4a05ec70
Related: OS#6933

bts: f_est_dchan(): populate UL SACCH cache

This ensures that UL SACCH blocks always contain the expected content
and a proper L1 SACCH header, rather than the dummy measurement report
hard-coded in trxcon/firmware.  As a result, the BTS receives
consistent and realistic UL SACCH from the very beginning.

Change-Id: I4781fe7539e64e77d594e84f905646c127f46b64
Related: OS#6933

library: make ts_MEAS_REP accept MeasurementResults

This reduces code duplication and makes ts_MEAS_REP easier to use.

Change-Id: I12113360f52b0ce09aa9bc11472fdd04bf14f368

bts: f_build_meas_res_tmpl(): expect specific L3 INFO

Change-Id: I1892d3ae3f72443ded6321487e9b191cd1948aac
Related: OS#6933