cluster.py: extract interface and add ClusterPoolAllocator #3517

Job	Run time
build-ceph	1m 55s
build	9m 56s
build-arm64	36m 35s
discovery (container)	3m 53s
demo (unsecured)	4m 20s
atom-nightly	0s
discovery (embedded)	3m 45s
demo (psk)	7m 27s
pytest (cli)	3m 0s
demo (dhchap)	6m 42s
pytest (cli_change_lb)	8m 3s
atom	6m 6s
ha (sanity)	3m 44s
pytest (cli_change_keys)	2m 56s
ha (no_huge)	3m 47s
pytest (cli_change_ns_visibility)	3m 15s
ha (ns_lb_change)	3m 44s
pytest (cli_trash_rbd)	5m 58s
ha (no_subsystems)	2m 37s
pytest (state)	2m 38s
ha (auto_load_balance)	20m 33s
pytest (multi_gateway)	2m 36s
ha (state_transitions)	2m 44s
pytest (server)	3m 13s
ha (state_transitions_both_gws)	3m 15s
pytest (grpc)	2m 55s
ha (state_transitions_loop)	7m 43s
pytest (omap_lock)	3m 29s
ha (state_transitions_rand_loop)	8m 53s
pytest (log_files)	3m 21s
ha (late_registration)	3m 51s
pytest (nsid)	3m 23s
ha (late_registration_loop)	7m 20s
pytest (psk)	2m 41s
ha (4gws)	8m 20s
ha (4gws_loop)	10m 39s
pytest (dhchap)	3m 38s
ha (4gws_create_delete)	10m 29s
pytest (subsys_grp_name_append)	2m 24s
ha (4gws_create_delete_loop)	14m 16s
ha (namespaces)	14m 30s
ha (namespaces_loop)	27m 9s
ha (mtls)	3m 30s
ha (notify)	2m 6s
ha (ceph_status)	2m 18s
ha (blocklist)	2m 27s
ha (main_exit)	1m 38s
push-images-to-ceph-registry	1s
push-devel-image-to-ceph-registry	1s
pull-and-run-images	1s
	4h 59m 45s

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