Added unb2_board_qsfp_leds.vhd plus test bench.

boards/uniboard2/libraries/unb2_board/hdllib.cfg

...d2/libraries/unb2_board/src/vhdl/unb2_board_qsfp_leds.vhd

.../libraries/unb2_board/tb/vhdl/tb_unb2_board_qsfp_leds.vhd