test: Add test for Groonga's delete command
groonga: Add delete command
test: Specify id as a string
groonga: Increment counter correctly
test: Fix wrong parameters for Rroonga APIs
test: Add test for not implemented "filter" parameter
test: Add drntest cases for Groonga's delete
Fix mismatched constant name
test: Fix expected error messages
groonga: Use "id" for non-array tables
groonga: Receive "filter" parameter value
test: Define table with a fixture
groonga: Ignore missing record by delete command