mgcp/test: Don't reset conn_mode between messages

Currently, the conn_mode field is reset after it has been checked.

This patch disables this behaviour and only adds a mark (bit) to
detect modifications.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/mgcp/mgcp_test.ok b/openbsc/tests/mgcp/mgcp_test.ok
index 3b645e6..fbe2566 100644
--- a/openbsc/tests/mgcp/mgcp_test.ok
+++ b/openbsc/tests/mgcp/mgcp_test.ok
@@ -21,6 +21,7 @@
 Requested packetetization period: 20-20
 Connection mode: 1, BTS output enabled, NET output disabled
 Testing MDCX3
+Dummy packets: 1
 Packet duration not set
 Requested packetization period not set
 Connection mode not set