Verify python source files with flake8 #3152

Job	Run time
build-ceph	1m 40s
build	9m 12s
build-arm64	1h 1m 14s
discovery (container)	4m 4s
atom	35m 12s
discovery (embedded)	3m 46s
demo (unsecured)	4m 33s
demo (psk)	5m 23s
ha (sanity)	3m 52s
demo (dhchap)	5m 29s
ha (no_huge)	4m 7s
pytest (cli)	2m 52s
ha (ns_lb_change)	3m 52s
pytest (cli_change_lb)	8m 20s
ha (no_subsystems)	3m 18s
pytest (cli_change_keys)	3m 16s
ha (auto_load_balance)	20m 10s
pytest (cli_change_ns_visibility)	3m 3s
ha (state_transitions)	4m 39s
ha (state_transitions_both_gws)	6m 21s
ha (state_transitions_loop)	20m 57s
pytest (state)	2m 39s
ha (state_transitions_rand_loop)	27m 5s
pytest (multi_gateway)	2m 35s
ha (late_registration)	4m 45s
pytest (server)	3m 14s
ha (late_registration_loop)	9m 0s
ha (4gws)	8m 58s
pytest (grpc)	2m 54s
ha (4gws_loop)	11m 10s
pytest (omap_lock)	3m 35s
ha (4gws_create_delete)	9m 2s
pytest (log_files)	3m 15s
ha (4gws_create_delete_loop)	12m 20s
ha (namespaces)	12m 15s
pytest (nsid)	3m 25s
ha (namespaces_loop)	22m 24s
pytest (psk)	3m 11s
ha (mtls)	3m 55s
pytest (dhchap)	2m 27s
ha (notify)	2m 8s
ha (ceph_status)	2m 22s
ha (blocklist)	2m 41s
ha (main_exit)	1m 38s
push-devel-image-to-ceph-registry	0s
push-images-to-ceph-registry	0s
	6h 12m 18s

Provide feedback