CBQE-0: add more logs n1ql

Change-Id: Iabd8f5da28b3d18d3935389dfe914587010204f2
Reviewed-on: http://review.couchbase.org/43191
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>