Give a chance to complete server.accept

* test/net/ftp/test_ftp.rb (test_tls_connect_timeout): get rid of a test error on Windows.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/net/ftp/test_ftp.rb

@@ -2120,6 +2120,7 @@ EOF
                        open_timeout: 0.1)
         end
       ensure
+        sleep 0.1 # give a chance to complete server.accept
         sock.close if sock
         server.close
       end