fix octphy, fix conf, improve logging

Clearly separate the kinds of BTS hardware the GSM tester knows ('type') from
the NITB's bts/type config item ('osmobsc_bts_type' -- not 'osmonitb_...' to
stay in tune with future developments: it is the libbsc that needs this).

For BTS hardware kinds, use the full name of the binary for osmo driven models:
osmo-bts-sysmo, osmo-bts-trx, osmo-bts-octphy.

Change-Id: I1aa9b48e74013a93f9db1a34730f17717fb3b36c
diff --git a/selftest/real_suite/default.conf b/selftest/real_suite/default.conf
index 8c7d1e5..626da4b 100644
--- a/selftest/real_suite/default.conf
+++ b/selftest/real_suite/default.conf
@@ -11,6 +11,7 @@
   location_area_code: 23
   base_station_id_code: 63
   stream_id: 255
+  osmobsc_bts_type: sysmobts
   trx_list:
   - max_power_red: 22
     arfcn: 868