mgcp: Disable output enabled on initialisation

Currently RTP output_enabled is set to 1 on initialisation, which
does not semantically match the initial value of conn_mode
(MGCP_CONN_NONE).

This patch changes this initial value to 0.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/mgcp/mgcp_test.ok b/openbsc/tests/mgcp/mgcp_test.ok
index 7e8aa5c..3b645e6 100644
--- a/openbsc/tests/mgcp/mgcp_test.ok
+++ b/openbsc/tests/mgcp/mgcp_test.ok
@@ -51,7 +51,7 @@
 Testing DLCX
 Detected packet duration: 20
 Requested packetization period not set
-Connection mode: 0, BTS output enabled, NET output enabled
+Connection mode: 0, BTS output disabled, NET output disabled
 Testing CRCX_ZYN
 Dummy packets: 1
 Packet duration not set
@@ -67,7 +67,7 @@
 Testing DLCX
 Detected packet duration: 20
 Requested packetization period not set
-Connection mode: 0, BTS output enabled, NET output enabled
+Connection mode: 0, BTS output disabled, NET output disabled
 Testing CRCX
 Re-transmitting CRCX
 Testing RQNT1