Allocate cluster context per ANA group #480

Job	Run time
build-ceph	2m 2s
build	7m 26s
demo	4m 10s
discovery (container)	3m 40s
ha (sanity)	3m 45s
discovery (embedded)	4m 18s
pytest (cli)	1m 52s
ha (state_transitions)	3m 28s
pytest (state)	1m 53s
ha (state_transitions_both_gws)	4m 41s
pytest (multi_gateway)	2m 8s
ha (state_transitions_loop)	12m 34s
pytest (server)	2m 33s
ha (state_transitions_rand_loop)	14m 38s
pytest (grpc)	1m 44s
pytest (omap_lock)	3m 34s
pytest (old_omap)	1m 44s
pytest (log_files)	3m 23s
push-to-registry	1s
	1h 19m 34s

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