osmo-bts-trx: Big refactor and cleanup of osmo-trx related code

* This commit is a preparation for future commits to add support for
different osmo-trx devices and backends like osmo-trx-lms.

* Drop deprecated osmo-trx-* cmd line params and use VTY cfg to set them.

* As number of osmo-trx related osmo-gsm-tester attributes grow, group
them togther in an "osmo_trx" dictionary.

Change-Id: I77d29413c9e3b600b796627ba366f80c3281b7e1
diff --git a/selftest/suite_test/resources.conf b/selftest/suite_test/resources.conf
index 440e55c..bd121cb 100644
--- a/selftest/suite_test/resources.conf
+++ b/selftest/suite_test/resources.conf
@@ -33,7 +33,9 @@
   ipa_unit_id: 6
   addr: 10.42.42.52
   band: GSM-1800
-  launch_trx: true
+  osmo_trx:
+    launch_trx: true
+    clock_reference: external
   trx_list:
   - nominal_power: 10
     max_power_red: 2
@@ -44,7 +46,10 @@
   ipa_unit_id: 7
   addr: 10.42.42.53
   band: GSM-1800
-  trx_remote_ip: 10.42.42.112
+  osmo_trx:
+    launch_trx: false
+    clock_reference: external
+    trx_ip: 10.42.42.112
   trx_list:
   - nominal_power: 10
     max_power_red: 3
@@ -56,7 +61,10 @@
   ipa_unit_id: 7
   addr: 10.42.42.53
   band: GSM-1800
-  trx_remote_ip: 10.42.42.112
+  osmo_trx:
+    launch_trx: false
+    clock_reference: external
+    trx_ip: 10.42.42.112
   trx_list:
   - nominal_power: 10
   - nominal_power: 12