ensure that template support does xml import/export

[hairmare]

The idea is to do most heavy lifting in the xml format and just manage xml exports under code control.

This enables me to create some simple erb files and most use cases should be satisfied.

I also realized, that speccing out new templates in puppet would is not really handy, and might also make this a support nightmare.

[hairmare]

mostly solved in zabbix_configuration_import... still needs real spec tests though