CBQE-0: fix typos in memorysanitytests logs

Change-Id: I1b1ccdc10721520b68e9cb9fa3976f5f0d8c568d
Reviewed-on: http://review.couchbase.org/28304
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>