run tests with erp5_full_text_mroonga_catalog instead of erp5_full_text_myisam_catalog.
test: update for recent erp5_full_text_mroonga_catalog.
* is also a boolean mode decorator.
use DefaultKey as a base class of FullTextKey.

so that it supports other comparison operators like '>', 'like' etc.
support other comparison operators than match or match_boolean in MroongaFullTextKey.