tests/ha: add late registration tests #517

Job	Run time
build	7m 15s
build-ceph	2m 35s
discovery (container)	4m 36s
demo	4m 32s
discovery (embedded)	4m 32s
pytest (cli)	3h 29m 56s
ha (sanity)	3m 59s
pytest (state)	1m 55s
ha (state_transitions)	3m 28s
pytest (multi_gateway)	3h 29m 55s
ha (state_transitions_both_gws)	4m 34s
pytest (server)	3h 29m 56s
ha (state_transitions_loop)	12m 59s
pytest (grpc)	3h 29m 57s
ha (state_transitions_rand_loop)	19m 41s
pytest (omap_lock)	3h 29m 56s
ha (late_registration)	32m 12s
pytest (old_omap)	3h 29m 55s
pytest (log_files)	3h 29m 57s
pytest (nsid)	3h 29m 57s
ha (late_registration_loop)	32m 13s
push-to-registry	1s
	1d 6h 14m 1s

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