add ci test to run the testbenches and fix testbenches for now #10

Job	Run time
Get testbenches	4s
testbench (umi/testbench/test_fifo.py)	1m 14s
testbench (umi/testbench/test_mem_agent.py)	1m 8s
testbench (umi/testbench/test_crossbar.py)	1m 10s
testbench (umi/testbench/test_fifo_flex.py)	1m 10s
testbench (umi/testbench/test_regif.py)	1m 13s
testbench (lumi/testbench/test_lumi.py)	1m 17s
testbench (lumi/testbench/test_lumi_rnd.py)	1m 20s
testbench (utils/testbench/test_umi_address_remap.py)	1m 6s
testbench (utils/testbench/test_umi_packet_merge_greedy.py)	1m 11s
testbench (utils/testbench/test_umi2tl_np.py)	1m 23s
	12m 16s

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