DRILL-7196: Queries are still runnable on disabled plugins - Storage client is not created anymore for disabled plugins - GET "/storage/{name}.json" endpoint now working with plugin configuration directly, without client instantination. It have increased UI responsitivity. - Hbase and mongo base test classes refactored to honor enabled plugin attribute - Fixed path contructor for mongo test datasets: Now it is cross-platform - Fixed test json files format which using plugin definitions - Code cleanup