Add ttcn3-bts-test env

Change-Id: I3251a49503dc823f0ef1fe8ef5d68236a584dad4
diff --git a/example/resources.conf.rnd b/example/resources.conf.rnd
index 7483260..05fce87 100644
--- a/example/resources.conf.rnd
+++ b/example/resources.conf.rnd
@@ -87,3 +87,6 @@
   auth_algo: 'comp128v1'
   ciphers: [a5_0, a5_1]
   features: ['gprs', 'sim']
+
+osmocon_phone:
+- serial_device: '/dev/serial/by-id/usb-Silicon_Labs_CP2104_USB_to_UART_Bridge_Controller_0089279D-if00-port0'