ignore exception is the address is IPv6

some environments disables IPv6 even if they have IPv6 addresses.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53294 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/socket/test_socket.rb

@@ -240,9 +240,12 @@ class TestSocket < Test::Unit::TestCase
           unix_server = Socket.unix_server_socket("#{tmpdir}/sock")
           tcp_servers.each {|s|
             addr = s.connect_address
-            assert_nothing_raised("connect to #{addr.inspect}") {
+            begin
               clients << addr.connect
-            }
+            rescue
+              # allow failure if the address is IPv6
+              raise unless addr.ipv6?
+            end
           }
           addr = unix_server.connect_address
           assert_nothing_raised("connect to #{addr.inspect}") {