Ruby: add the code generated from reflection.proto

[south37]

Ref

#2567

Why

Sometimes we want to use gRPC Server Reflection in Ruby.

What

This PR adds the code generated from reflection.proto.

• src/ruby/pb/grpc/reflection/v1alpha/reflection_pb.rb
• src/ruby/pb/grpc/reflection/v1alpha/reflection_services_pb.rb

By this change, we can use reflection feature in Ruby.

[1] pry(main)> require 'grpc/reflection/v1alpha/reflection_services_pb'
=> true
[2] pry(main)> Grpc::Reflection::V1alpha.constants
=> [:ErrorResponse,
 :ServerReflection,
 :ServerReflectionRequest,
 :ServerReflectionResponse,
 :ExtensionRequest,
 :FileDescriptorResponse,
 :ExtensionNumberResponse,
 :ListServiceResponse,
 :ServiceResponse]
[3] pry(main)> Grpc::Reflection::V1alpha::ServerReflectionRequest.new
=> <Grpc::Reflection::V1alpha::ServerReflectionRequest: host: "", file_by_filename: "", file_containing_symbol: "", file_containing_extension: nil, all_extension_numbers_of_type: "", list_services: "">

require 'grpc/reflection/v1alpha/reflection_services_pb'

class ReflectionService < Grpc::Reflection::V1alpha::ServerReflection::Service
  def server_reflection_info(requests, call)
    # Implement reflection feature here.
  end
end

I also updated src/ruby/pb/generate_proto_ruby.sh, which seems to be a utility script for code generation in Ruby.

@nicolasnoble

[stale]

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