minor ping/keepalive tweaks #756

Job	Run time
build	9m 28s
build-ceph	2m 21s
demo	3m 41s
discovery (container)	4m 18s
ha (sanity)	4m 15s
discovery (embedded)	3m 59s
ha (state_transitions)	3m 15s
pytest (cli)	2m 11s
ha (state_transitions_both_gws)	4m 26s
pytest (cli_change_lb)	6m 51s
ha (state_transitions_loop)	11m 42s
pytest (state)	2m 14s
ha (state_transitions_rand_loop)	15m 11s
pytest (multi_gateway)	2m 21s
ha (late_registration)	4m 24s
pytest (server)	2m 57s
ha (late_registration_loop)	15m 38s
pytest (grpc)	3m 16s
ha (4gws)	5m 52s
pytest (omap_lock)	5m 54s
ha (4gws_loop)	7m 7s
pytest (old_omap)	2m 26s
ha (4gws_create_delete)	6m 6s
pytest (log_files)	2m 50s
ha (4gws_create_delete_loop)	7m 18s
pytest (nsid)	3m 48s
ha (namespaces)	9m 38s
ha (namespaces_loop)	5m 4s
ha (mtls)	3m 36s
ha (notify)	2m 13s
push-images-to-private-registry	0s
push-images-to-ceph-registry	0s
	2h 44m 20s

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