MB-9846 Start diag with user visible logs.

Change-Id: I14973ba2692af2cfff9afe358e9756ad75ad7c16
Reviewed-on: http://review.couchbase.org/33012
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>