fix permissions on testbenches #7

# to view logs

Job	Run time
testbench (lumi/testbench/test_lumi.py)	1m 18s
testbench (lumi/testbench/test_lumi_rnd.py)	1m 22s
testbench (umi/testbench/test_crossbar.py)	1m 13s
testbench (umi/testbench/test_fifo_flex.py)	1m 36s
testbench (umi/testbench/test_fifo.py)	1m 5s
testbench (umi/testbench/test_mem_agent.py)	1m 12s
testbench (umi/testbench/test_regif.py)	1m 10s
testbench (utils/testbench/test_umi_address_remap.py)	1m 6s
testbench (utils/testbench/test_umi_packet_merge_greedy.py)	1m 13s
testbench (utils/testbench/test_umi2tl_np.py)	1m 20s
	12m 35s

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