CBQE-0:passwords with space are not allowed anymore

Change-Id: I77be48694ff6df332609403157a69ce72676e4bb
Reviewed-on: http://review.couchbase.org/28594
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>