NTLM: Reset auth-done when using a fresh connection

With NTLM a new connection will always require authentication.
Fixes #435

Author: iboukris

lib/url.c

@@ -5839,12 +5839,14 @@ static CURLcode create_conn(struct SessionHandle *data,
        data->state.authhost.done) {
       infof(data, "NTLM picked AND auth done set, clear picked!\n");
       data->state.authhost.picked = CURLAUTH_NONE;
+      data->state.authhost.done = FALSE;
     }
 
     if((data->state.authproxy.picked & (CURLAUTH_NTLM | CURLAUTH_NTLM_WB)) &&
        data->state.authproxy.done) {
       infof(data, "NTLM-proxy picked AND auth done set, clear picked!\n");
       data->state.authproxy.picked = CURLAUTH_NONE;
+      data->state.authproxy.done = FALSE;
     }
 #endif
   }