FEATURE: libnetconf errors passing

Errors during session connection can be passed into nc_callback_print().
They are passed to GUI by now samely as from nc_callback_error_reply().
diff --git a/src/mod_netconf.c b/src/mod_netconf.c
index 56d1542..09ca131 100644
--- a/src/mod_netconf.c
+++ b/src/mod_netconf.c
@@ -956,19 +956,21 @@
 
 void clb_print(NC_VERB_LEVEL level, const char* msg)
 {
+#define FOREACH(I) \
+        I(NC_VERB_ERROR) I(NC_VERB_WARNING) \
+        I(NC_VERB_VERBOSE) I(NC_VERB_DEBUG)
+#define CASE(VAL) case VAL: DEBUG("%s: %s", #VAL, msg); \
+	break;
+
 	switch (level) {
-	case NC_VERB_ERROR:
-		DEBUG("%s", msg);
-		break;
-	case NC_VERB_WARNING:
-		DEBUG("%s", msg);
-		break;
-	case NC_VERB_VERBOSE:
-		DEBUG("%s", msg);
-		break;
-	case NC_VERB_DEBUG:
-		DEBUG("%s", msg);
-		break;
+	FOREACH(CASE)
+	}
+	if (level == NC_VERB_ERROR) {
+		/* return global error */
+		netconf_callback_error_process(NULL /* tag */, NULL /* type */,
+				NULL /* severity */, NULL /* apptag */,
+				NULL /* path */, msg, NULL /* attribute */,
+				NULL /* element */, NULL /* ns */, NULL /* sid */);
 	}
 }