nua: fixed authentication-related bugs #1685245 and #1570746.
If the credentials were rejected with 401/407, do not restart the request but flush the cached username/password pairs from authentication clients. Now also feed the Authentication-Info and Proxy-Authentication-Info headers to the authentication clients. darcs-hash:20070326154413-55b16-198582d0fa070d5e062eeebfa33814b49407ad6c.gz
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