Make ssl_server2's HVR handling more realistic

It makes not sense to keep the connection open until the client is verified.
Until now it was useful since closing it crates a race where the second
ClientHello might be lost. But now that our client is able to resend, that's
not an issue any more.

tests/ssl-opt.sh

@@ -2170,7 +2170,6 @@ run_test    "DTLS proxy: reference" \
             -S "record from another epoch" \
             -C "discarding invalid record" \
             -S "discarding invalid record" \
-            -C "resend" \
             -S "resend" \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"
@@ -2185,7 +2184,6 @@ run_test    "DTLS proxy: duplicate every packet" \
             -s "replayed record" \
             -c "discarding invalid record" \
             -s "discarding invalid record" \
-            -C "resend" \
             -S "resend" \
             -s "Extra-header:" \
             -c "HTTP/1.0 200 OK"