Extend _show command after _find command in table facets
Allow pagination to table facets which needs to call _show on all rows
with additional parameter. 'show_command_additional_attr' can be set to any
attribute from result of _find command. This attribute is taken with its value
and added to options of _each command for each row.
Part of: https://fedorahosted.org/freeipa/ticket/5426
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>