Fix: Disabled graph db host added as instance

dalmdl/dgraph/dgraph.go

@@ -98,6 +98,10 @@ func InitInstances(configs []Host) error {
 	instances = make(map[string]*Instance, len(configs))
 
 	for _, host := range configs {
+		if host.IsDisabled {
+			continue
+		}
+
 		client, err := NewClient(host)
 		if err != nil {
 			return err