Implement the ability to pass in RavenDB Configuration file settings

[TraGicCode]

We need to implement a way for the client to pass in key value pais that can be placed correctly into the ravendb configuration file. Currently values are hardcoded to the default after install.

https://github.com/TraGicCode/tragiccode-ravendb/blob/master/templates/Raven.Server.exe.config.epp

[TraGicCode]

Example2:
https://github.com/puppetlabs/puppet-enterprise-consul-docker-demo/blob/cedb8a6694bf6b49d6b610219988d2cbb252700d/modules/ssh/manifests/client.pp#L1-L29

Example3:
https://github.com/puppetlabs/puppetconf-partner-demo-env/blob/a1c85dc451cd9e6a523ecd5c1ad40d0da312b291/environments/production/modules/apt/manifests/init.pp

Example4:
https://github.com/voxpupuli/puppet-facette/blob/7f4b14d6ec8fda4e561d254572df9dd2decd6a29/manifests/init.pp

Example5:
https://github.com/voxpupuli/puppet-rundeck/blob/09cfa226acadb619a3085815569c2b5aa27a045f/manifests/config/global/framework.pp

Example6:
https://github.com/voxpupuli/puppet-zabbix/blob/3b3bcd12cb15fd67ee098b885eae5f803390acd1/manifests/web.pp#L415-L464

Example8:
https://github.com/voxpupuli/puppet-proxysql/blob/69503bbe8e73d53ea378821293f24828200b5edf/manifests/init.pp#L109-L175