parser/tests: Extend parse_implied_field() for .buf
parser/tests: Extend parse_implied_field() for .buf

* RESET_IS_COMPLETED_TaskSpecs accepts (struct TaskSpecs *)
* Rename gen_name_spec() to gen_name_spec_with_run()
* Add gen_name_spec_with_buf()
* Move common part of parse_implied_field() to check_parse_implied_field()

globbie/knowdy,globbie/knowdy,globbie/knowdy