add ignore setting for test property file
implements list_datastores_result models.
test for list_datastores_result with ds_dict
refactoring packages for json result models.
impelemtns list_datastores url generate
refactoring datastore api requestor, method parameter's order changed.
implements for list_datastore requestor and get_or_create_requestor
impelemtns datastores api dsls
refactoring DSL method signiture and add liscense comment