mgw: Test DLCX in three diffeent (valid) configurations

DLCX can be with EP-only, with EP+CallId or with EP+CallId+ConnId,
let's test all three valid cases.
diff --git a/mgw/MGCP_Test.cfg b/mgw/MGCP_Test.cfg
index 8d79271..94d80a1 100644
--- a/mgw/MGCP_Test.cfg
+++ b/mgw/MGCP_Test.cfg
@@ -26,4 +26,6 @@
 MGCP_Test.TC_crcx_sdp
 MGCP_Test.TC_mdcx_without_crcx
 MGCP_Test.TC_dlcx_without_crcx
-MGCP_Test.TC_crcx_and_dlcx
+MGCP_Test.TC_crcx_and_dlcx_ep_callid_connid
+MGCP_Test.TC_crcx_and_dlcx_ep_callid
+MGCP_Test.TC_crcx_and_dlcx_ep