tport: tport_name_is_resolved() now uses host_is_ip_address()
tport: tport_name_is_resolved() now uses host_is_ip_address()

darcs-hash:20071120170919-65a35-7ed08de61d6d7829d71619c1aead27efe7616933.gz

unispeech/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,xhook/sofia-sip,jart/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,erdincay/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,BelledonneCommunications/sofia-sip,unispeech/sofia-sip,jart/sofia-sip,BelledonneCommunications/sofia-sip,xhook/sofia-sip,jart/sofia-sip,xhook/sofia-sip