remove operation id prefix

[yuhaibohotmail]

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Fix #866

When use smallrye openapi operationid strategy CLASS_METHOD,operationId fields take the form of "class_name_method". For example, "User_findAll". We want remove operationId prefix (e.g. User_findAll=> findAll)

In this PR, we add a config properties remove-operation-id-prefix,to delete class name from operationId. The properties are passed to the openapi-generator, and the specific functions are executed by the openapi-generator.

https://github.com/OpenAPITools/openapi-generator/blob/4c5a57fe7bae59483bb8fa9218be8dc4f82e1bda/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java#L5638

[yuhaibohotmail]

@ricardozanini @ricardozanini
Sorry I messed up my commit, so I rebuilt this PR.

[ricardozanini]

It's an unusual use case; many thanks for bringing this to our attention and sending the PR.

Now, with the test, it makes much more sense.