Return IQ reply to the exact component's connection that made the request. External components that may be connected from several places at once may not be able to handle an IQ reply sent to another connection. Thus lets try to send the IQ reply to the exact connection that sent the packet.
Once XEP-225 is completed this trick may no longer be needed. Since each component's connection should have a unique JID of the form subdomain.domain/MyConnection.