Remove any previous private key when adding letsencrypt cert

src/freedombone-addcert

     if [ -f /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key ]; then
         if [ ! -f /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key.old ]; then
             mv /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key.old
+		else
+			rm -f /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key
         fi
     fi
     ln -s /etc/letsencrypt/live/${LETSENCRYPT_HOSTNAME}/privkey.pem /etc/ssl/private/${LETSENCRYPT_HOSTNAME}.key
     if [ -f /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem ]; then
         if [ ! -f /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem.old ]; then
             mv /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem.old
+		else
+			rm -f /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem
         fi
     fi
     ln -s /etc/letsencrypt/live/${LETSENCRYPT_HOSTNAME}/fullchain.pem /etc/ssl/certs/${LETSENCRYPT_HOSTNAME}.pem