Merge pull request #11764 from apolcyn/fix_ruby_socket_leak

src/ruby/lib/grpc/generic/active_call.rb

src/ruby/lib/grpc/generic/bidi_call.rb

src/ruby/lib/grpc/generic/rpc_desc.rb

src/ruby/lib/grpc/generic/rpc_server.rb

src/ruby/spec/client_auth_spec.rb

src/ruby/spec/generic/active_call_spec.rb

src/ruby/spec/generic/client_stub_spec.rb

src/ruby/spec/generic/rpc_desc_spec.rb

src/ruby/spec/generic/rpc_server_spec.rb

src/ruby/spec/testdata/client.key

src/ruby/spec/testdata/client.pem