Authorisation header is only being sent for some operations

[pahjbo]

When implementing orppst/pst-api-service#26 it has become clear that not all operations in the code generated from the openapi spec are getting the authorisation header sent. There is an issue open on the code generation on fabien0102/openapi-codegen#226 which also describes this problem - there is also an associated PR which is probably a point fix.

I think that the generated code could do a better job of actually creating an interface that described the parameters so that less overriding of input objects were necessary.