gbproxy: Fix race condition checking for unblocked BVC

It sometimes happens that the ttcn3 test checks the BVC FSM state before
the gbproxy had time to process the BVC_RESET_ACK from the "SGSN". It
then reports the state WAIT_RESET_ACK which will fail the test.

Introduce a small wait to give the gbproxy some more time.

Change-Id: Ic31b2188195c5d76b2d5aac9fa1f0b4efa5ca8b2
diff --git a/gbproxy/GBProxy_Tests.ttcn b/gbproxy/GBProxy_Tests.ttcn
index 6aa5e0c..035a47d 100644
--- a/gbproxy/GBProxy_Tests.ttcn
+++ b/gbproxy/GBProxy_Tests.ttcn
@@ -631,6 +631,10 @@
 		}
 	}
 
+	/* Wait to ensure the gbproxy processed the RESET_ACK messages from the SGSN.
+	 * Otherwise the state might still be WAIT_RESET_ACK */
+	f_sleep(0.2);
+
 	/* verify all SGSN-side BVC FSM in IUT are UNBLOCKED */
 	for (i := 0; i < lengthof(mp_nsconfig_sgsn); i := i+1) {
 		f_bvc_fsm_ensure_state(mp_nsconfig_sgsn[i].nsei, 0, "UNBLOCKED");