report_ttl, node_ttl and node_purge_ttl not working

The parameters are set in the class puppetdb or puppetdb::server however it is not being sent to the puppetdb::server::database_ini.

And in puppetdb::server::database_ini it uses the default value from params.pp instead of any value being received by the class.

This pull request fixes the 3 new parameters to work.