Allocate cluster context per ANA group #475

Job	Run time
build	6m 46s
build-ceph	1m 56s
demo	4m 10s
discovery (container)	3m 44s
ha (sanity)	3m 46s
discovery (embedded)	3m 30s
pytest (cli)	2m 36s
ha (state_transitions)	3m 44s
pytest (state)	1m 53s
ha (state_transitions_both_gws)	4m 41s
ha (state_transitions_loop)	10m 20s
pytest (multi_gateway)	2m 11s
ha (state_transitions_rand_loop)	10m 16s
pytest (server)	3m 39s
pytest (grpc)	2m 54s
pytest (omap_lock)	3m 32s
pytest (old_omap)	1m 43s
pytest (log_files)	3m 25s
push-to-registry	1s
	1h 14m 47s

Provide feedback