CBQE-0 add logs for autocompaction tests

Change-Id: I770c493595452b4228770cf132f00be14c00766d
Reviewed-on: http://review.couchbase.org/26466
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>