Add test to ensure that all generic_methods use normal ordering for promise types
A good convention when writing CFEngine code is to always put the promises in a bundle in the normal ordering (vars, classes, etc). This makes it clear when a normal ordering problem can hit you (for example #5443).
Everything is test-based in ncf, so we should add a test in tests/style to check this. Benoît, I know you have written one for rudder-techniques, can you add/port it to ncf please?