suites: Wait for BTS to connect to BSC before continuing

Change-Id: I027e3bfb8f470a811e65e718e2a8c46809fe6396
diff --git a/suites/aoip_encryption/register_a5_0_authopt.py b/suites/aoip_encryption/register_a5_0_authopt.py
index 75614e2..6a06078 100755
--- a/suites/aoip_encryption/register_a5_0_authopt.py
+++ b/suites/aoip_encryption/register_a5_0_authopt.py
@@ -22,6 +22,7 @@
 bsc.bts_add(bts)
 bsc.start()
 bts.start()
+wait(bsc.bts_is_connected, bts)
 
 ms.log_info()
 good_ki = ms.ki()