CBQE-1841: tuq: add simple test for inner join

Change-Id: I73a66b1be3dde83f68fb9cd6ce656095ca239c36
Reviewed-on: http://review.couchbase.org/31770
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>