test_s2.c: add From tag to s2-generated requests
test_s2.c: add From tag to s2-generated requests

darcs-hash:20080910154636-db55f-7a8cc270dec3d432635a8d3272e266c1ac4f8964.gz

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