osmo-trx: Add cfg template

Since commit 3da1f8352e337fb032bf7a58c2909d3ba918e237, osmo-trx requires
a cfg file to start successfully.

Change-Id: I8f0e0d0a9fa849f41c3cccc4059431f62f956eac
diff --git a/src/osmo_gsm_tester/templates/osmo-trx.cfg.tmpl b/src/osmo_gsm_tester/templates/osmo-trx.cfg.tmpl
new file mode 100644
index 0000000..a197c59
--- /dev/null
+++ b/src/osmo_gsm_tester/templates/osmo-trx.cfg.tmpl
@@ -0,0 +1,15 @@
+!
+! OsmoHLR example configuration
+!
+log stderr
+  logging filter all 1
+  logging color 1
+  logging print category 1
+  logging timestamp 1
+  logging print extended-timestamp 1
+  logging level all info
+!
+line vty
+ bind ${osmo_trx.bind_ip}
+ctrl
+ bind ${osmo_trx.bind_ip}