control/server.py: support --cpumask=0xF #2457

Job	Run time
build-ceph	2m 6s
build-arm64	1h 5m 30s
build	9m 42s
demo-secure	3m 50s
discovery (container)	3m 55s
atom	34m 45s
demo	3m 47s
discovery (embedded)	3m 44s
ha (sanity)	4m 12s
pytest (cli)	2m 23s
ha (state_transitions)	4m 43s
pytest (cli_change_lb)	6m 52s
ha (state_transitions_both_gws)	6m 17s
pytest (state)	2m 12s
ha (state_transitions_loop)	20m 35s
pytest (multi_gateway)	2m 11s
ha (state_transitions_rand_loop)	28m 43s
pytest (server)	2m 32s
pytest (grpc)	2m 42s
ha (late_registration)	4m 25s
pytest (omap_lock)	3m 18s
ha (late_registration_loop)	9m 6s
pytest (old_omap)	2m 13s
pytest (log_files)	2m 58s
pytest (nsid)	3m 8s
pytest (psk)	2m 4s
ha (4gws)	8m 50s
ha (4gws_loop)	11m 38s
ha (4gws_create_delete)	8m 52s
ha (4gws_create_delete_loop)	10m 51s
ha (namespaces)	13m 33s
ha (namespaces_loop)	24m 5s
ha (mtls)	3m 52s
ha (notify)	2m 22s
ha (ceph_status)	2m 34s
push-images-to-ceph-registry	0s
	5h 24m 30s

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