Exclude ruby/tutorial5 from CI

It fails with obscure networking issues on CI
and passes on 2 different OSes locally.

test.py

@@ -76,9 +76,9 @@ tests = {
                   ['php']),
              '%(arg2)s'),
     'tut5': (skip(gen('emit_log_topic', arg='%(arg)s.foo %(arg2)s'),
-                  ['php']),
+                  ['php', 'ruby']),
              skip(gen('receive_logs_topic', arg='%(arg)s.*'),
-                  ['php']),
+                  ['php', 'ruby']),
              '%(arg2)s'),
     'tut6': (skip(gen('rpc_client', java='RPCClient', dotnet='RPCClient'),
                   ['erlang']),