The 'runner_config' variable name is particularly misleading because
there is a class called RunnerConfig, and that variable does not
contain one.
Rename it to 'runners_yaml' since it contains the parsed contents of
the runners.yaml file. Rename the variable that refers to the path
itself to 'runners_yaml_path'. No functional changes expected.
This is prep work for redoing how actual RunnerConfig objects get
made.
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
e63d299515