Do not process gRPC calls when gateway is going down #3113

Job	Run time
build-arm64	1h 0m 5s
build-ceph	1m 43s
build	9m 26s
discovery (container)	3m 56s
pytest (cli)	2m 36s
pytest (cli_change_lb)	8m 6s
pytest (cli_change_keys)	3m 6s
discovery (embedded)	3m 42s
pytest (state)	2m 50s
pytest (multi_gateway)	2m 39s
atom	35m 3s
demo (unsecured)	4m 10s
pytest (server)	3m 25s
demo (psk)	5m 33s
pytest (grpc)	2m 56s
demo (dhchap)	5m 23s
pytest (omap_lock)	3m 49s
ha (sanity)	3m 46s
pytest (log_files)	3m 14s
ha (no_huge)	3m 46s
pytest (nsid)	3m 24s
ha (ns_lb_change)	3m 48s
pytest (psk)	2m 26s
pytest (dhchap)	2m 43s
ha (no_subsystems)	2m 43s
ha (auto_load_balance)	19m 59s
ha (state_transitions)	4m 43s
ha (state_transitions_both_gws)	6m 36s
ha (state_transitions_loop)	20m 31s
ha (state_transitions_rand_loop)	25m 29s
ha (late_registration)	4m 17s
ha (late_registration_loop)	9m 39s
ha (4gws)	8m 52s
ha (4gws_loop)	11m 28s
ha (4gws_create_delete)	9m 0s
ha (4gws_create_delete_loop)	11m 12s
ha (namespaces)	11m 57s
ha (namespaces_loop)	21m 53s
ha (mtls)	3m 36s
ha (notify)	2m 15s
ha (ceph_status)	2m 12s
ha (blocklist)	2m 28s
ha (main_exit)	1m 44s
push-devel-image-to-ceph-registry	0s
push-images-to-ceph-registry	0s
	6h 2m 9s

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