[VTY] add more cell reselection parameters to VTY

allow setting of 'cell reselection hysteresis' and 'rxlev access min' from VTY
for experiments with cell reselection.
diff --git a/openbsc/src/gsm_data.c b/openbsc/src/gsm_data.c
index 88de4c4..fef1127 100644
--- a/openbsc/src/gsm_data.c
+++ b/openbsc/src/gsm_data.c
@@ -167,6 +167,8 @@
 	bts->num_trx = 0;
 	INIT_LLIST_HEAD(&bts->trx_list);
 	bts->ms_max_power = 15;	/* dBm */
+	bts->si_common.cell_sel_par.cell_resel_hyst = 2; /* 4 dB */
+	bts->si_common.cell_sel_par.rxlev_acc_min = 0;
 
 	for (i = 0; i < ARRAY_SIZE(bts->gprs.nsvc); i++) {
 		bts->gprs.nsvc[i].bts = bts;