Added regression tbfor eth library. Still need to fix run -all, because due to...

Added regression tbfor eth library. Still need to fix run -all, because due to sim FAILURE the sim already stops at the first tb that finishes.

libraries/io/eth/tb/vhdl/tb_tb_tb_eth_regression.vhd

+-------------------------------------------------------------------------------
+--
+-- Copyright (C) 2010
+-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
+-- JIVE (Joint Institute for VLBI in Europe) <http://www.jive.nl/>
+-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+--
+-------------------------------------------------------------------------------
+
+-- Purpose: Multi-testbench for regression test of all tb in eth library
+-- Description:
+-- Usage:
+--   > as 4
+--   > run -all
+
+LIBRARY IEEE;
+USE IEEE.std_logic_1164.ALL;
+
+ENTITY tb_tb_tb_eth_regression IS
+END tb_tb_tb_eth_regression;
+
+ARCHITECTURE tb OF tb_tb_tb_eth_regression IS
+BEGIN
+
+  u_tb_tb_eth          : ENTITY work.tb_tb_eth;
+  u_tb_eth_hdr         : ENTITY work.tb_eth_hdr;
+  u_tb_eth_checksum    : ENTITY work.tb_eth_checksum;
+  u_tb_eth_crc_ctrl    : ENTITY work.tb_eth_crc_ctrl;
+  u_tb_eth_udp_offload : ENTITY work.tb_eth_udp_offload;
+  u_tb_eth_IHL_to_20   : ENTITY work.tb_eth_IHL_to_20;
+  
+END tb;