Added helper method to load combined config files for Rego unit tests

[darrendao]

This is similar to the existing parse_config and parse_config_file methods, but it'll work on combined config files instead.

With this, we can do something like this when unit testing rego files

test_parse_combined_config_files {
	count(violation) == 1 with input as parse_combined_config_files(["deployment.yaml", "service.yaml"])
}

Signed-off-by: Darren Dao [email protected]

[jpreese]

This makes sense to me. Thanks for your contribution! 🎉

[tonglil]

Would really appreciate a function like this to parse a directory, vs specifying individual files!