copy_table_desc.rb script

[Lars George]

Hi,

trying to run the `copy_table_desc.rb` script from the
`bin/replication` directory gives this:

```
$ bin/hbase org.jruby.Main bin/replication/copy_tables_desc.rb
localhost:2181:hbase localhost:2182:hbase-2 testtable4
...
NativeException: java.io.IOException:
java.lang.reflect.InvocationTargetException
  (root) at bin/replication/copy_tables_desc.rb:81
```

All my 5min attempts of coercing the script kiddie JRuby code to
output debug info was futile, hence leaving this here for vetting :)

Lars