Allocate cluster context per ANA group #490

Job	Run time
build	6m 59s
build-ceph	1m 57s
discovery (container)	3m 42s
demo	3m 46s
discovery (embedded)	3m 32s
pytest (cli)	1m 52s
ha (sanity)	3m 46s
pytest (state)	2m 2s
ha (state_transitions)	3m 37s
pytest (multi_gateway)	2m 6s
ha (state_transitions_both_gws)	4m 35s
pytest (server)	2m 38s
ha (state_transitions_loop)	12m 40s
pytest (grpc)	2m 31s
ha (state_transitions_rand_loop)	16m 1s
pytest (omap_lock)	4m 13s
pytest (old_omap)	1m 45s
pytest (log_files)	3m 23s
pytest (nsid)	2m 49s
push-to-registry	0s
	1h 23m 54s

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