Remove combined_api_server.go.
Remove combined_api_server.go.

ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm,klucar/pachyderm,sambooo/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,sambooo/pachyderm,klucar/pachyderm,alexdebrie/pachyderm