CBQE-0: add more logs to upgrade

Change-Id: Ib5d9d583d880afb41a0221c6371ae32b730d8335
Reviewed-on: http://review.couchbase.org/28466
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>