Skip test_cp_r_socket on JRuby

Author: jeremyevans

test/fileutils/test_fileutils.rb

@@ -451,6 +451,7 @@ def test_cp_r_dev
   rescue LoadError
   else
     def test_cp_r_socket
+      skip "Skipping socket test on JRuby" if RUBY_ENGINE == 'jruby'
       Dir.mkdir('tmp/cpr_src')
       UNIXServer.new('tmp/cpr_src/socket').close
       cp_r 'tmp/cpr_src', 'tmp/cpr_dest'