improve connection failure message in IPA emulation

Show addresses and ports which were attempted in the IPA
connection failure message.

Example output:
Verdict: fail reason: Could not connect IPA socket from "" port -1 \
	to "127.0.0.1" port 4238; check your configuration

Change-Id: I828fe67d66bcd668aa14922b89a2feac56dc2d9a
diff --git a/library/IPA_Emulation.ttcnpp b/library/IPA_Emulation.ttcnpp
index 5c385e6..7a26a6b 100644
--- a/library/IPA_Emulation.ttcnpp
+++ b/library/IPA_Emulation.ttcnpp
@@ -208,7 +208,8 @@
 	res := IPA_CodecPort_CtrlFunct.f_IPL4_connect(IPA_PORT, remote_host, remote_port,
 						local_host, local_port, 0, { tcp:={} });
 	if (not ispresent(res.connId)) {
-		setverdict(fail, "Could not connect IPA socket, check your configuration");
+		setverdict(fail, "Could not connect IPA socket from ", local_host, " port ", local_port,
+			   " to ", remote_host, " port ", remote_port, "; check your configuration");
 		mtc.stop;
 	}
 	g_ipa_conn_id := res.connId;