Restored rekey.sh to its original form.

regress/rekey.sh

@@ -20,7 +20,7 @@ ssh_data_rekeying()
  _opts="$_opts -o$_kexopt"
  fi
  rm -f ${COPY} ${LOG}
- _opts="$_opts -oCompression=no -cchacha20-poly1305@openssh.com"
+ _opts="$_opts -oCompression=no"
  ${SSH} <${DATA} $_opts -v -F $OBJ/ssh_proxy somehost "cat > ${COPY}"
  echo "exit code $?"
  if [ $? -ne 0 ]; then
@@ -42,9 +42,6 @@ for i in `${SSH} -Q kex`; do
  opts="$opts KexAlgorithms=$i"
 done
 for i in `${SSH} -Q cipher`; do
- if [ "$i" = "chacha20-poly1305-mt@hpnssh.org" ]; then
- break
- fi
  opts="$opts Ciphers=$i"
 done
 for i in `${SSH} -Q mac`; do