MB-9412: sanitize bits of config logged from conflict resolution

I.e. so that passwords are not leaked this way

Change-Id: Iec8411681578b344c353c43e4ed5a88c37ab11c1
Reviewed-on: http://review.couchbase.org/30038
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>