CBQE-0: add more logs to n1ql

Change-Id: I0f0bfdb2a650b49e3633a55da0c618265b71bd55
Reviewed-on: http://review.couchbase.org/41641
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>