Hi: In some cases, we need to be able to specify the number of worker processes to limit the number of allowed CPUs.
The current default `auto` is not flexible enough. ``` nginx_config: worker_process: 'auto' # defines the number of worker processes. default is `auto`. ``` -- *MembPhis* My github: https://github.com/membphis Apache APISIX: https://github.com/apache/incubator-apisix
